This document contains 55 questions related to electricity and magnetism for an exam. The questions cover topics like electrostatics, DC circuits, magnetic fields, magnetic induction, AC generators, self-inductors and transformers, and three-phase current. They involve calculating things like electric field, force, voltage, current, charge, power, inductance, and more for various circuit and field configurations. The questions require applying concepts like Coulomb's law, Ohm's law, and formulas for capacitance, inductance, and electromagnetic induction.
Class 11 important questions for physics Current ElectricityInfomatica Academy
Here you can get Class 11 Important Questions for Physics based on NCERT Textbook for Class XI. Physics Class 11 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Current Electricity for Class 11 Physics subject.
This document discusses electric current and direct current circuits. It begins by providing an analogy comparing voltage, resistance, and current to gravity, friction, and the flow of water in a river. It then defines electric current microscopically as the drift velocity of electrons in a metal when an electric field is applied. It provides the formula for current as the rate of flow of charge. Several examples are worked through applying this formula. The document continues by defining Ohm's law and resistivity. It explains how resistance depends on the properties and dimensions of the conductor. Finally, it discusses how resistance varies with temperature and defines the temperature coefficient of resistivity.
The document discusses electric current, resistance, electromotive force, and some basic circuit concepts:
1) Electric current is defined as the flow of electric charge through a cross-sectional area per unit time. It is measured in amperes.
2) Resistance depends on the length, cross-sectional area, temperature, and material of a conductor. It is measured in ohms.
3) An electromotive force is a device that provides electric potential difference (voltage) to push current through a circuit against resistance. Batteries and generators are common sources of electromotive force.
ANURAG TYAGI CLASSES (ATC) is an organisation destined to orient students into correct path to achieve
success in IIT-JEE, AIEEE, PMT, CBSE & ICSE board classes. The organisation is run by a competitive staff comprising of Ex-IITians. Our goal at ATC is to create an environment that inspires students to recognise and explore their own potentials and build up confidence in themselves.ATC was founded by Mr. ANURAG TYAGI on 19 march, 2001.
MEET US AT:
www.anuragtyagiclasses.com
This document provides information about the Basic Electrical Engineering course offered by the EC department at VCET PUTTUR. The course code is 18ELE23 and it is worth 3 credits. The course aims to teach students about DC and AC electric circuits, transformers, DC machines, synchronous generators, and electrical wiring. The course is divided into 5 modules covering topics such as DC circuits, single and 3-phase AC circuits, transformers, DC motors and generators, and induction motors. The document also provides information on electric circuits, Ohm's law, series and parallel resistances, and single-phase AC circuits including definitions of terms like frequency, time period, effective value, and form factor. It includes example problems related to AC circuits.
This document discusses basic electrical concepts including:
- Electrical circuits consist of basic elements like current, potential difference, and resistance. Ohm's law relates these factors.
- Current is the flow of electrons measured in amperes. Potential difference (voltage) is the energy given to electrons measured in volts.
- Resistance depends on a material's ability to prevent electron flow and is calculated using resistance equals voltage divided by current.
- Circuits can be connected in series or parallel, affecting how voltage, current, and resistance are distributed.
- Power, measured in watts, is the rate of electrical energy transfer based on voltage and current. Common units like kilowatt-hours are used to measure electrical
Electricity, without notes, without answersMrPolko
This document discusses basic electrical concepts including circuits, current, voltage, resistance, and power. It defines current as the flow of electric charge measured in amperes. Voltage or electric potential difference (PD) is the amount of energy given to each coulomb of charge and is measured in volts. Resistance is a material's ability to prevent electron flow and is calculated using Ohm's Law. Circuits can be connected in series or parallel, and power is calculated as voltage times current, measured in watts. Examples of calculations using these concepts are also provided.
The document discusses Kirchhoff's laws of electrical circuits and their applications. Kirchhoff's first law, also known as the junction law, states that the algebraic sum of all currents meeting at a junction is zero. Kirchhoff's second law states that the algebraic sum of the potential differences (voltage drops) around any closed network plus the emfs in the circuit is zero. The document also explains Wheatstone bridge circuit, meter bridge method for determining unknown resistances, Kelvin's method for measuring galvanometer resistance using meter bridge, sources of errors and their minimization in these experiments, and the principle and applications of potentiometer for measuring emf and internal resistance of a cell.
Class 11 important questions for physics Current ElectricityInfomatica Academy
Here you can get Class 11 Important Questions for Physics based on NCERT Textbook for Class XI. Physics Class 11 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Current Electricity for Class 11 Physics subject.
This document discusses electric current and direct current circuits. It begins by providing an analogy comparing voltage, resistance, and current to gravity, friction, and the flow of water in a river. It then defines electric current microscopically as the drift velocity of electrons in a metal when an electric field is applied. It provides the formula for current as the rate of flow of charge. Several examples are worked through applying this formula. The document continues by defining Ohm's law and resistivity. It explains how resistance depends on the properties and dimensions of the conductor. Finally, it discusses how resistance varies with temperature and defines the temperature coefficient of resistivity.
The document discusses electric current, resistance, electromotive force, and some basic circuit concepts:
1) Electric current is defined as the flow of electric charge through a cross-sectional area per unit time. It is measured in amperes.
2) Resistance depends on the length, cross-sectional area, temperature, and material of a conductor. It is measured in ohms.
3) An electromotive force is a device that provides electric potential difference (voltage) to push current through a circuit against resistance. Batteries and generators are common sources of electromotive force.
ANURAG TYAGI CLASSES (ATC) is an organisation destined to orient students into correct path to achieve
success in IIT-JEE, AIEEE, PMT, CBSE & ICSE board classes. The organisation is run by a competitive staff comprising of Ex-IITians. Our goal at ATC is to create an environment that inspires students to recognise and explore their own potentials and build up confidence in themselves.ATC was founded by Mr. ANURAG TYAGI on 19 march, 2001.
MEET US AT:
www.anuragtyagiclasses.com
This document provides information about the Basic Electrical Engineering course offered by the EC department at VCET PUTTUR. The course code is 18ELE23 and it is worth 3 credits. The course aims to teach students about DC and AC electric circuits, transformers, DC machines, synchronous generators, and electrical wiring. The course is divided into 5 modules covering topics such as DC circuits, single and 3-phase AC circuits, transformers, DC motors and generators, and induction motors. The document also provides information on electric circuits, Ohm's law, series and parallel resistances, and single-phase AC circuits including definitions of terms like frequency, time period, effective value, and form factor. It includes example problems related to AC circuits.
This document discusses basic electrical concepts including:
- Electrical circuits consist of basic elements like current, potential difference, and resistance. Ohm's law relates these factors.
- Current is the flow of electrons measured in amperes. Potential difference (voltage) is the energy given to electrons measured in volts.
- Resistance depends on a material's ability to prevent electron flow and is calculated using resistance equals voltage divided by current.
- Circuits can be connected in series or parallel, affecting how voltage, current, and resistance are distributed.
- Power, measured in watts, is the rate of electrical energy transfer based on voltage and current. Common units like kilowatt-hours are used to measure electrical
Electricity, without notes, without answersMrPolko
This document discusses basic electrical concepts including circuits, current, voltage, resistance, and power. It defines current as the flow of electric charge measured in amperes. Voltage or electric potential difference (PD) is the amount of energy given to each coulomb of charge and is measured in volts. Resistance is a material's ability to prevent electron flow and is calculated using Ohm's Law. Circuits can be connected in series or parallel, and power is calculated as voltage times current, measured in watts. Examples of calculations using these concepts are also provided.
The document discusses Kirchhoff's laws of electrical circuits and their applications. Kirchhoff's first law, also known as the junction law, states that the algebraic sum of all currents meeting at a junction is zero. Kirchhoff's second law states that the algebraic sum of the potential differences (voltage drops) around any closed network plus the emfs in the circuit is zero. The document also explains Wheatstone bridge circuit, meter bridge method for determining unknown resistances, Kelvin's method for measuring galvanometer resistance using meter bridge, sources of errors and their minimization in these experiments, and the principle and applications of potentiometer for measuring emf and internal resistance of a cell.
This document contains a physics exam with 37 multiple choice questions related to topics like mechanics, electromagnetism, thermodynamics, and modern physics. The questions cover concepts such as circular motion in a magnetic field, magnetic field strength required to maintain a charged particle's trajectory, oscillations of magnets and springs, work done by magnetic fields, resistivity of materials at different temperatures, and more.
This document discusses three effects of electricity: thermal, chemical, and thermoelectric. The thermal effect explains how an electric current produces heat due to the collision of electrons with atoms in a conductor. Joule's law quantifies this relationship. The chemical effect discusses electrolysis and Faraday's laws of electrolysis. Electrolysis is the process of using a direct current to cause a non-spontaneous chemical reaction. The thermoelectric effect explains how a temperature difference across junctions of two different conductors can produce an electric current, as described by Seebeck's discovery of the thermoelectric effect. Key concepts covered include Seebeck series, neutral temperature, and temperature of inversion.
This document contains a series of ConcepTests (conceptual multiple choice questions) from a physics textbook on circuits and electricity. The questions cover topics like series and parallel resistors, short circuits, Kirchhoff's rules, and Wheatstone bridges. For each question, the correct answer is provided along with a brief explanation of the reasoning.
The document discusses a workshop organized by KV Andrews Ganj to prepare sample higher-order thinking (HOT) questions for Class XII Physics. [1] A two-day workshop was held in July 2008 with 10 Physics teachers from various KVs participating. [2] The teachers worked to computerize chapter-wise sample HOT questions for CBSE Class XII Physics. [3] The principal expresses that this material will help students and teachers perform better in board exams, while noting that teachers can prepare additional questions to improve student competency.
This document contains solutions to 12 exam problems from a physics course. The solutions provide the following key details:
1) For the first problem, the solution states that statement (a) is true - just after closing the switch, resistor 1 carries zero current.
2) For the second problem, the solution states that statements (a), (b), and (c) are all true regarding the magnetic properties of paramagnetic and diamagnetic materials.
3) For the last problem, the solution finds that the net magnetic flux through the curved surface of a Gaussian cylinder must be 47.4 mWb directed inward to satisfy that the total flux through any closed surface is zero.
The document provides information on electric current, including definitions of conventional current, drift velocity, current density, and Ohm's law. It discusses resistance, resistivity, conductance, and conductivity and how they relate to temperature, length, and other factors. The document also covers color codes for carbon resistors, and series and parallel combinations of resistors and cells. It defines emf and potential difference, and discusses the internal resistance of cells and how series and parallel connections of cells affect total emf, internal resistance, and current.
Magnetic effects of_electric_current(_ncert_questions)AlkaVarshney2
This document contains 23 multiple choice questions related to magnetic effects of electric current. The questions cover topics like magnetic field patterns around current carrying wires, electromagnetic induction, electric generators, motors, transformers and other electric devices. There are also questions about the right hand rule, Fleming's left hand rule and their applications to determine magnetic field directions.
MOST IMPORTANT QUESTIONS FOR CURRENT ELECTRICITY CBSE XII BY ATCDeepankur Rastogi
This document contains a 30 question physics exam on topics related to current and electricity for Class XII. The exam covers concepts such as superconductors, current, resistance, Ohm's law, circuits, and applications of electricity. Questions involve calculations related to resistors, current, power, and electric cells. Diagrams and derivations of formulas are also assessed. The exam is designed based on the new CBSE board examination pattern for 2013-14.
1. The document provides study material on current electricity, defining it as the branch of physics dealing with the flow of electric charges.
2. It defines electric current as the rate of flow of electric charges across any cross-sectional area of a conductor. Current is directly proportional to charge and inversely proportional to time.
3. Ohm's law is described, stating that the current through a conductor is directly proportional to the potential difference across it, if the physical conditions like temperature and pressure remain constant.
This document outlines key concepts from Chapter 6a and 6b on electricity and magnetism. It covers topics such as positive and negative charge, Coulomb's law, conductors and insulators, Ohm's law, electromagnets, electromagnetic induction, and transformers. The main points are that opposite charges attract and like charges repel, Coulomb's law describes the electrostatic force between two charged particles, conductors allow electric charge to flow easily while insulators do not, and electromagnetic induction produces an electric current from a changing magnetic field.
1. The document discusses concepts related to electrostatics including electric charge, conductors, insulators, Coulomb's law, and how charge can be transferred or induced in objects.
2. Coulomb's law describes the proportional relationship between the electric force between two point charges and the charges' magnitudes and the distance between them.
3. There are several ways to charge an object, including friction, induction, conduction, and grounding. Charged objects exert forces on each other according to Coulomb's law.
Extra review (electricity and magnetism) by shykh salamabdul salam shaikh
This document provides a sample review with 45 multiple choice questions covering concepts in electricity and magnetism from a Physics 11 course. The questions cover topics like electric charges and forces, electric circuits, magnetic fields, electromagnetic induction, transformers, and motors. This review is intended to help students practice and review key concepts in preparation for further assessment.
The document discusses electric current and related concepts. It defines current as the flow of electric charge from one place to another, measured in amperes. Current can be direct or alternating. Resistance is a property that weakens current flow and is measured in ohms. Ohm's law states current is directly proportional to voltage and inversely proportional to resistance. Kirchhoff's laws govern the analysis of electric circuits.
1) The document discusses static electricity and electric current. It explains how charging by friction can create static electricity and defines electric current as the rate of flow of electric charge.
2) Key concepts covered include the structure of atoms, charging by transferring electrons between materials, and how static charge is held on insulators while current involves the flow of electrons in conductors.
3) The document provides examples of current in series and parallel circuits, noting that current is the same everywhere in a series circuit while the total current entering a parallel junction equals the sum of the currents in the branches.
Electricity is a form of energy that is invisible but can be observed through its effects, such as during lightning storms. It is caused by an imbalance of electric charges within atoms. Important early discoveries about electricity were made by scientists like Benjamin Franklin and Michael Faraday. Coulomb's law describes the force of attraction or repulsion between two charged objects. Static electricity occurs when friction separates electric charges within materials, causing them to become positively or negatively charged. Current electricity involves the flow of charged particles called electrons. Ohm's law defines the relationship between voltage, current, and resistance in an electrical circuit.
1. The document discusses electricity, including electric charge, current, potential difference, and circuits. It defines key terms and concepts and provides examples of calculations.
2. Series and parallel circuits are analyzed and compared. Equations for current, voltage, and resistance in each type of circuit are provided.
3. The relationship between potential difference and current is explored through Ohm's Law. Factors that affect resistance are also described.
1) The document discusses carrier transport in semiconductors, including drift and diffusion currents. Carrier drift occurs due to an electric field and is characterized by carrier mobility, while diffusion is due to concentration gradients and characterized by the diffusion coefficient.
2) Mobility is affected by phonon and ionized impurity scattering. The net mobility is the sum of these scattering components. Conductivity is directly proportional to carrier concentration and mobility.
3) The Hall effect can be used to determine the type of semiconductor (n-type or p-type), carrier concentration, and carrier mobility. Measurement of the Hall voltage polarity indicates type, and its magnitude relates to concentration and mobility.
1. The document discusses various topics in electrostatics including line integrals of electric fields, electric potential and potential differences, Gauss's theorem, and applications of Gauss's theorem.
2. Key concepts covered are the definitions of electric potential and potential difference, the relationship between electric field and potential via line integrals, and Gauss's theorem that the electric flux through any closed surface is equal to the enclosed charge divided by the permittivity of free space.
3. Examples are given of using Gauss's theorem to calculate electric fields, such as for an infinite line charge, planar sheet of charge, and spherical shell of charge.
This document provides an overview of basic electricity and magnetism concepts. It defines electricity as the flow of electrons and static electricity as the buildup of electrons on objects from rubbing. Charges can be positive or negative depending on whether electrons are gained or lost. Conductors and insulators are described, as well as batteries, circuits, resistance, magnetism, electromagnets, generators, motors, and the difference between direct and alternating current. Key formulas like Ohm's Law are also presented.
Class 11 important questions for physics Magnetic Effect of Electric CurrentInfomatica Academy
Here you can get Class 11 Important Questions for Physics based on NCERT Textbook for Class XI. Physics Class 11 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Magnetic Effect of Electric Current for Class 11 Physics subject.
1. This document provides numerical problems related to electric potential, electric potential energy, and capacitance. It includes 55 problems covering topics like calculating potential due to point charges, work done in electric fields, potential energy of charge configurations, capacitance of parallel plate and other capacitors, and energy stored in capacitors.
2. Many problems involve calculating electric potential, electric field intensity, or capacitance given charges and distances between charges or capacitor plate separations. Other problems calculate work done, potential energy, or energy stored in capacitors.
3. The problems cover basic concepts in electrostatics and capacitance and provide practice calculating various quantities using the fundamental equations for these topics.
This document contains a physics exam with 37 multiple choice questions related to topics like mechanics, electromagnetism, thermodynamics, and modern physics. The questions cover concepts such as circular motion in a magnetic field, magnetic field strength required to maintain a charged particle's trajectory, oscillations of magnets and springs, work done by magnetic fields, resistivity of materials at different temperatures, and more.
This document discusses three effects of electricity: thermal, chemical, and thermoelectric. The thermal effect explains how an electric current produces heat due to the collision of electrons with atoms in a conductor. Joule's law quantifies this relationship. The chemical effect discusses electrolysis and Faraday's laws of electrolysis. Electrolysis is the process of using a direct current to cause a non-spontaneous chemical reaction. The thermoelectric effect explains how a temperature difference across junctions of two different conductors can produce an electric current, as described by Seebeck's discovery of the thermoelectric effect. Key concepts covered include Seebeck series, neutral temperature, and temperature of inversion.
This document contains a series of ConcepTests (conceptual multiple choice questions) from a physics textbook on circuits and electricity. The questions cover topics like series and parallel resistors, short circuits, Kirchhoff's rules, and Wheatstone bridges. For each question, the correct answer is provided along with a brief explanation of the reasoning.
The document discusses a workshop organized by KV Andrews Ganj to prepare sample higher-order thinking (HOT) questions for Class XII Physics. [1] A two-day workshop was held in July 2008 with 10 Physics teachers from various KVs participating. [2] The teachers worked to computerize chapter-wise sample HOT questions for CBSE Class XII Physics. [3] The principal expresses that this material will help students and teachers perform better in board exams, while noting that teachers can prepare additional questions to improve student competency.
This document contains solutions to 12 exam problems from a physics course. The solutions provide the following key details:
1) For the first problem, the solution states that statement (a) is true - just after closing the switch, resistor 1 carries zero current.
2) For the second problem, the solution states that statements (a), (b), and (c) are all true regarding the magnetic properties of paramagnetic and diamagnetic materials.
3) For the last problem, the solution finds that the net magnetic flux through the curved surface of a Gaussian cylinder must be 47.4 mWb directed inward to satisfy that the total flux through any closed surface is zero.
The document provides information on electric current, including definitions of conventional current, drift velocity, current density, and Ohm's law. It discusses resistance, resistivity, conductance, and conductivity and how they relate to temperature, length, and other factors. The document also covers color codes for carbon resistors, and series and parallel combinations of resistors and cells. It defines emf and potential difference, and discusses the internal resistance of cells and how series and parallel connections of cells affect total emf, internal resistance, and current.
Magnetic effects of_electric_current(_ncert_questions)AlkaVarshney2
This document contains 23 multiple choice questions related to magnetic effects of electric current. The questions cover topics like magnetic field patterns around current carrying wires, electromagnetic induction, electric generators, motors, transformers and other electric devices. There are also questions about the right hand rule, Fleming's left hand rule and their applications to determine magnetic field directions.
MOST IMPORTANT QUESTIONS FOR CURRENT ELECTRICITY CBSE XII BY ATCDeepankur Rastogi
This document contains a 30 question physics exam on topics related to current and electricity for Class XII. The exam covers concepts such as superconductors, current, resistance, Ohm's law, circuits, and applications of electricity. Questions involve calculations related to resistors, current, power, and electric cells. Diagrams and derivations of formulas are also assessed. The exam is designed based on the new CBSE board examination pattern for 2013-14.
1. The document provides study material on current electricity, defining it as the branch of physics dealing with the flow of electric charges.
2. It defines electric current as the rate of flow of electric charges across any cross-sectional area of a conductor. Current is directly proportional to charge and inversely proportional to time.
3. Ohm's law is described, stating that the current through a conductor is directly proportional to the potential difference across it, if the physical conditions like temperature and pressure remain constant.
This document outlines key concepts from Chapter 6a and 6b on electricity and magnetism. It covers topics such as positive and negative charge, Coulomb's law, conductors and insulators, Ohm's law, electromagnets, electromagnetic induction, and transformers. The main points are that opposite charges attract and like charges repel, Coulomb's law describes the electrostatic force between two charged particles, conductors allow electric charge to flow easily while insulators do not, and electromagnetic induction produces an electric current from a changing magnetic field.
1. The document discusses concepts related to electrostatics including electric charge, conductors, insulators, Coulomb's law, and how charge can be transferred or induced in objects.
2. Coulomb's law describes the proportional relationship between the electric force between two point charges and the charges' magnitudes and the distance between them.
3. There are several ways to charge an object, including friction, induction, conduction, and grounding. Charged objects exert forces on each other according to Coulomb's law.
Extra review (electricity and magnetism) by shykh salamabdul salam shaikh
This document provides a sample review with 45 multiple choice questions covering concepts in electricity and magnetism from a Physics 11 course. The questions cover topics like electric charges and forces, electric circuits, magnetic fields, electromagnetic induction, transformers, and motors. This review is intended to help students practice and review key concepts in preparation for further assessment.
The document discusses electric current and related concepts. It defines current as the flow of electric charge from one place to another, measured in amperes. Current can be direct or alternating. Resistance is a property that weakens current flow and is measured in ohms. Ohm's law states current is directly proportional to voltage and inversely proportional to resistance. Kirchhoff's laws govern the analysis of electric circuits.
1) The document discusses static electricity and electric current. It explains how charging by friction can create static electricity and defines electric current as the rate of flow of electric charge.
2) Key concepts covered include the structure of atoms, charging by transferring electrons between materials, and how static charge is held on insulators while current involves the flow of electrons in conductors.
3) The document provides examples of current in series and parallel circuits, noting that current is the same everywhere in a series circuit while the total current entering a parallel junction equals the sum of the currents in the branches.
Electricity is a form of energy that is invisible but can be observed through its effects, such as during lightning storms. It is caused by an imbalance of electric charges within atoms. Important early discoveries about electricity were made by scientists like Benjamin Franklin and Michael Faraday. Coulomb's law describes the force of attraction or repulsion between two charged objects. Static electricity occurs when friction separates electric charges within materials, causing them to become positively or negatively charged. Current electricity involves the flow of charged particles called electrons. Ohm's law defines the relationship between voltage, current, and resistance in an electrical circuit.
1. The document discusses electricity, including electric charge, current, potential difference, and circuits. It defines key terms and concepts and provides examples of calculations.
2. Series and parallel circuits are analyzed and compared. Equations for current, voltage, and resistance in each type of circuit are provided.
3. The relationship between potential difference and current is explored through Ohm's Law. Factors that affect resistance are also described.
1) The document discusses carrier transport in semiconductors, including drift and diffusion currents. Carrier drift occurs due to an electric field and is characterized by carrier mobility, while diffusion is due to concentration gradients and characterized by the diffusion coefficient.
2) Mobility is affected by phonon and ionized impurity scattering. The net mobility is the sum of these scattering components. Conductivity is directly proportional to carrier concentration and mobility.
3) The Hall effect can be used to determine the type of semiconductor (n-type or p-type), carrier concentration, and carrier mobility. Measurement of the Hall voltage polarity indicates type, and its magnitude relates to concentration and mobility.
1. The document discusses various topics in electrostatics including line integrals of electric fields, electric potential and potential differences, Gauss's theorem, and applications of Gauss's theorem.
2. Key concepts covered are the definitions of electric potential and potential difference, the relationship between electric field and potential via line integrals, and Gauss's theorem that the electric flux through any closed surface is equal to the enclosed charge divided by the permittivity of free space.
3. Examples are given of using Gauss's theorem to calculate electric fields, such as for an infinite line charge, planar sheet of charge, and spherical shell of charge.
This document provides an overview of basic electricity and magnetism concepts. It defines electricity as the flow of electrons and static electricity as the buildup of electrons on objects from rubbing. Charges can be positive or negative depending on whether electrons are gained or lost. Conductors and insulators are described, as well as batteries, circuits, resistance, magnetism, electromagnets, generators, motors, and the difference between direct and alternating current. Key formulas like Ohm's Law are also presented.
Class 11 important questions for physics Magnetic Effect of Electric CurrentInfomatica Academy
Here you can get Class 11 Important Questions for Physics based on NCERT Textbook for Class XI. Physics Class 11 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on Magnetic Effect of Electric Current for Class 11 Physics subject.
1. This document provides numerical problems related to electric potential, electric potential energy, and capacitance. It includes 55 problems covering topics like calculating potential due to point charges, work done in electric fields, potential energy of charge configurations, capacitance of parallel plate and other capacitors, and energy stored in capacitors.
2. Many problems involve calculating electric potential, electric field intensity, or capacitance given charges and distances between charges or capacitor plate separations. Other problems calculate work done, potential energy, or energy stored in capacitors.
3. The problems cover basic concepts in electrostatics and capacitance and provide practice calculating various quantities using the fundamental equations for these topics.
This document contains a multiple choice quiz on DC circuits concepts. There are 42 questions covering topics like resistors in series and parallel, capacitors, electric fields, magnetic fields, inductance, and transformers. The questions require calculations of resistance, capacitance, voltage, current, force, flux, and inductance values.
1) The document is about electromagnetic induction and contains sample problems related to topics like Faraday's laws, Lenz's law, induced EMF in moving conductors in magnetic fields, and circuit problems involving electromagnetic induction.
2) Some example problems calculate induced EMF and current in situations like changing magnetic flux through a coil, rotating loops in magnetic fields, and moving conductors in uniform magnetic fields.
3) The problems are from different sections covering concepts such as flux and Faraday's laws, Lenz's law, induced EMF in moving rods, and circuit analysis problems involving electromagnetic induction.
This document contains physics examination papers from 2008-2012 administered by the Central Board of Secondary Education (CBSE) in Delhi, India. It lists the contents which include CBSE examination papers from Delhi and All India in those years, as well as foreign papers. A sample paper from the 2008 Delhi exam is then provided, consisting of 30 multiple choice questions testing concepts in physics.
Physics Sample Paper with General Instruction for Class - 12Learning Three Sixty
Learning 360 brings “Physics sample paper” for CLASS – 12. This document also carries 31 questions with solution of each given question for better understanding of the students. Download for free now; http://www.learning360.net/study_hub/1090-2/
This document contains an unsolved physics exam from 1995 consisting of 50 multiple choice questions testing concepts in physics. The questions cover topics including p-n junctions, crystal structure, radioactive decay, nuclear binding energies, half life, electromagnetic waves, conductivity, X-rays, electron behavior, electric fields, circuits, heat transfer, magnetism, optics, quantum mechanics, and rotational motion. For each question, four possible answers are provided and test takers are asked to select the correct answer.
This document provides a tutorial on semiconductor diodes with 20 practice problems. It covers topics such as determining diode resistance and capacitance from characteristic curves, calculating diffusion current density, and solving circuits that include diodes and zener diodes. The problems involve calculating values such as current, voltage, resistance, capacitance, and concentrations using semiconductor properties, characteristic curves, and circuit equations.
This document contains a sample physics exam for Class XII with 30 questions covering topics such as electromagnetism, optics, modern physics, and semiconductor devices. The exam is 3 hours long and contains short answer and long answer questions worth varying point values. An introduction provides instructions on the number and type of questions, and lists important physical constants that may be needed.
The document is a physics exam with 42 multiple choice questions covering topics like thermodynamics, waves, optics, electricity, modern physics, and mechanics. It provides the question stem and four possible answer choices for each question.
Electric Current
Current is the rate of flow of charge, Q.
When charges flow, they can be positive or negative.
For historical reason, the direction of conventional current
is taken as the direction a positive charge will flow.
In a cell or battery, the chemical changes take place which
provide the energy required to push the electric charge
(electrons) round the circuit.
The electromotive force (e.m.f.) of any electrical source is the
work done by the source in driving a unit charge around a
complete circuit.
The SI unit for e.m.f. is joule per coulomb (J/C) or the volt (V)
The document provides information about current, electromotive force, potential difference, and resistance. It defines key terms, provides equations, and examples of calculations. It describes:
- Current is the flow of charge measured in amperes. It is carried by the flow of electrons in a conductor.
- Electromotive force is the work done per unit charge to drive charge around a complete circuit. It is measured in volts.
- Potential difference is the work done per unit charge to move charge through a circuit component. It is also measured in volts.
- Resistance is the opposition to current flow. It is calculated as potential difference divided by current and measured in ohms.
This document contains 20 analytical questions related to semiconductor devices. The questions cover topics such as determining resistivity of germanium under different doping conditions, calculating current density in silicon samples with both donor and acceptor impurities, finding carrier concentrations and resistances of PN junctions, calculating voltages and currents in diode circuits, and analyzing operational characteristics of transistors, MOSFETs, and SCRs. Solutions require using given parameters and equations related to semiconductor physics.
This document contains a solved physics paper from 1994 containing 44 multiple choice questions related to topics in physics. The questions cover concepts in electricity, magnetism, mechanics, waves, optics and modern physics. For each question, four answer choices are provided and the correct answer is to be indicated in the answer book by writing the letter (a), (b), (c) or (d).
This document contains an unsolved physics exam from 1995 containing 30 multiple choice problems. The problems cover topics in mechanics, thermodynamics, optics, electricity and magnetism, modern physics, and radioactivity. The full solutions are available online at www.vasista.net.
This document contains a sample physics question paper for Class 12 with 26 questions across 5 sections (A-E). It provides general instructions, details of questions in each section, and values of important physical constants. Section A contains 5 one-mark questions, Section B has 5 two-mark questions, Section C has 12 three-mark questions, Section D has 1 four-mark question and Section E contains 3 five-mark questions. The document tests students' understanding of concepts in electricity, magnetism, electromagnetic waves, optics, modern physics and electronics.
This document contains 30 practice questions covering topics in electricity and circuits including:
1. Direct current (DC) circuits
2. Capacitors
3. Electromagnetic induction
4. Blackbody radiation
The questions are multiple choice or require calculating values like current, voltage, impedance, energy, and more based on circuits diagrams and component specifications provided.
This document contains an unsolved physics exam from 1994 consisting of 44 multiple choice questions testing concepts in mechanics, electricity and magnetism, waves, optics and modern physics. The questions cover topics such as electric potential, work done by electric fields, simple harmonic motion, electromagnetic waves, reflection and refraction of light, quantum physics, and more.
Trusted Execution Environment for Decentralized Process MiningLucaBarbaro3
Presentation of the paper "Trusted Execution Environment for Decentralized Process Mining" given during the CAiSE 2024 Conference in Cyprus on June 7, 2024.
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
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Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
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Digital Banking in the Cloud: How Citizens Bank Unlocked Their MainframePrecisely
Inconsistent user experience and siloed data, high costs, and changing customer expectations – Citizens Bank was experiencing these challenges while it was attempting to deliver a superior digital banking experience for its clients. Its core banking applications run on the mainframe and Citizens was using legacy utilities to get the critical mainframe data to feed customer-facing channels, like call centers, web, and mobile. Ultimately, this led to higher operating costs (MIPS), delayed response times, and longer time to market.
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In the realm of cybersecurity, offensive security practices act as a critical shield. By simulating real-world attacks in a controlled environment, these techniques expose vulnerabilities before malicious actors can exploit them. This proactive approach allows manufacturers to identify and fix weaknesses, significantly enhancing system security.
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This presentation provides valuable insights into effective cost-saving techniques on AWS. Learn how to optimize your AWS resources by rightsizing, increasing elasticity, picking the right storage class, and choosing the best pricing model. Additionally, discover essential governance mechanisms to ensure continuous cost efficiency. Whether you are new to AWS or an experienced user, this presentation provides clear and practical tips to help you reduce your cloud costs and get the most out of your budget.
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Electricity&magnetism
1. ROVANIEMI UNIVERSITY OF APPLIED SCIENCE
SCHOOL OF TECHNOLOGY
Degree Programm of Informational Technology
EXERCISES OF ELECTRICITY AND MAGNETISM
Course 504D3B
Jouko Teeriaho
2007
2. Electrostatics
1. The magnitude of the electric eld is 18 kV /m. There is a 15 nC charge in the eld. Calculate
the Coulomb's force on the charge in the eld. (Coulomb constant is κ = 9 ∗ 109 Nm2 /C 2 )
2. Point charges 2.5 nC and -1.9 nC are at 0.50 m distance from each other. Calculate the force
between the charges.
3. Two charges 3 nC and -3 nC are at a distance of
10 cm from each other. Calculate the magnitude
of the electric eld at point P.
4. Answer without using calculator. Four equal positive charges are at the edges of a square.
a) What is the value of the electric eld at the center of
the square?
b) Assume, if only one of the charges would be present,
the eld at the center of the square would be 15 kV /m.
What is the value of the eld if any three of the charges
are present and one is missing?
5. How do you think, if there is somewhere on the straight line, which goes through 3 nC and
-1 nC charges, a point where the electric eld is zero. If you think that such point exist, mark
its position on the picture. (Calculate it rst)
6. An electron (m = 9.11 ∗ 10−31 kg , q = 1.6 ∗ 10−19 C ) is accelerated with 600 V potential
dierence. Calculate its end velocity using:
a) classical;
b) relativistic formula for kinetic energy;
c) how many percents the result (a) diers from the correct result (b)?
2
(Einsteins kinetic energy formula Ek = mc 2 − mc2 , c=300 M m/s)
1− v2
c
7. During a thunderstorm the electric eld increases up to 3 M V /m. Electrons are removed
from the atoms and lighting starts. The average free path of the electrons in air is 1.0 µm
before colliding with other atoms in the air. Calculate the speed of electrons.
8. The electric potential V around a point charge Q is obtained from V = κ Q , where κ = 9 ∗ 109 .
r
Assume that Q=+1.0 µC .
a) Calculate the voltage between points A and B , when A is at distance 0.5 m and B at
distance 2.5 m from the charge Q.
b) Could this voltage light a 1000 V light tube (yes or no)?
2
3. 9. ABC is an equilateral triangle of side 4.0 cm in a vacuum. There are point charges of 8.0 µC
at A and B. Find (a) the potential, (b) the electric eld intensity at C. State the direction of
the eld.
10. A conducting sphere of radius 5.0 cm has a charge of 0.4 µC . Find the potential:
a) 6.0 cm; b) 5.0 cm; c) 4.0 cm from the center of the sphere.
(Assume 1 πεo = 9.0 ∗ 109 m F −1 )
4
11. Calculate the electric eld at a point 50 cm from a 1500 nC charge. Also calculate the energy
on the air at that point.
12. A triangle has equal sides of 6 cm. The edges of the
triangle are 5 nC , 5 nC and -5 nC charges. Calculate
the electric eld in the middle of the triangle.
13. Calculate the speed of electron after it has been accelerated with 1000 V . (Use classical
Schuster's formula)
DC circuits
14. A capacitor is made of two 4.0 cm2 metal plates with 0.1 mm air between the plates. Calculate:
a) surface charge density σ if the charge is 2 pC ;
b) electric eld between the plates if the charge is 2 pC ;
c) the capacitance C;
d) maximum voltage between the plates;
e) maximum energy of the capacitor.
15. Assume that the capacitor in upwards problem is charged with with 6 V battery and the
battery is still maintaining 6 V potential dierence between the poles of the capacitor. A
thin plastic 0.1 mm foil is carefully put between the plates. (for plastic κ = 7) What happens?
a) Does the eld E in the capacitor charge?
b) Does the charge Q of the capacitor change?
c) Does the energy of the capacitor increase, decrease or remain the same?
d) Does the capacitance change?
16. Calculate the voltage between a cloud and the ground during a thunderstorm, when the
lighting starts. The cloud is 1200 m above the ground. Calculate also the surface charge
density σ of Earth under the cloud.
17. There are 12 bulbs in a candle series.
a) Calculate the voltage and current over one candle, if the power of a candle is 3.0 W and
we use 220 V AC.
b) If one of the candles is removed using a shortcut, what happens to the current and the
power output?
18. The length of a conducting wire is 2.87 m and diameter is 0.2 mm. Using 1.5 V we get
33.4 mA current. Calculate the resistance and the resistivity of the wire.
19. A capacitor of 0.012 mF is charged with 300 V . Calculate the amount of work needed.
3
4. 20. Two bulbs with texts (40 W , 220 V ) and (100 W , 220 V ) are connected (a) in series (b) in
parallel to 220 V power supply. Calculate the total current and power taken from the power
supply.
21. You have three 10 Ω resistors in your positions. What values of resistance can you build from
these resistors using dierent combinations. Draw pictures.
22. You have lots of 10 Ω resistors. Combine them in a way, which gives you exactly 3 Ω resistance.
Draw picture.
23. Find the (steady) current in a circuit when a charge of 40 C passes in 5 s.
24. What is the resistance of a copper cylinder of length 12 cm and cross-sectional area 0.4 cm2 ?
(Resistivity of copper = 1.7 ∗ 10−8 Ωm)
25. Find the value of the current, I , in each of the two circuits below.
26. A millimeter with a full-scale deection of 5.0 mA and a coil resistance of 50 Ω is to be used
as a voltmeter with a full-scale deection of 2.0 V . What size resistance needs to be placed
in series with the meter?
27. A millimeter with a full-scale deection of 20 mA and a coil resistance of 40 Ω is to be used
as a ammeter with a full-scale deection of 500 mA. What size shunt is required?
28. When a 12 V battery (i.e. a battery of EMF 12 V ) is connected across a lamp with a resistance
of 6.8 Ω the PD across the lamp is 10.2 V . Find:
a) the current through the lamp;
b) the inertial resistance of the battery.
29. A battery of EMF 6.0 V and internal resistance 2.0 Ω is connected across a torch bulb with
a resistance of 10 Ω. Calculate:
a) the current supplied by the battery;
b) the power consumed by the bulb;
c) the power consumed in the internal resistance of the battery.
Verify that the total power supplied by the battery is equal to the product of its EMF and
the current it supplies.
30. A 3.0 µF capacitor and a 5.0 µF capacitor are each in parallel with a 12 V supply. Calculate
the charge on each capacitor.
4
5. 31. Refer to Fig. 3. Calculate:
a) the charge on each capacitor;
b) the PD across each capacitor
in the circuit shown below.
32. A 4.0 µF capacitor and a 6.0 µF capacitor
are connected in series with a 20 V supply.
Calculate:
a) the charge on each capacitor;
b) the PD across each capacitor.
(Fig.3 )
33. A 500 µF capacitor with a charge of 3000 µC is discharged through a 200 κΩ resistor.
What is
a) the initial discharge current;
b) the current after 20 s?
34. Calculate the charge on the capacitor in the below circuit.
35. The following circuit is set up with both switches
open. Assume that the internal resistance of the
6.0 V cell is negligible. Calculate the charges store
on the capacitors M and N:
a) with S1 closed but S2 left open;
b) with both switches closed.
Magnetic elds
36. Calculate the radius of the trajectory of a proton which comes with the velocity of 260 Mm/s
at 90o angle to the magnetic eld of the Earth (55µT ). The mass and the charge of protons
are 1.7 ∗ 10−27 kg and 1.6 ∗ 10−19 C.
37. In radiation treatment of cancer electrons are accelerated with a small cyclotron with radius
10 cm and magnetic eld of 0.005 T.
a) What is the speed of the electrons when they come out from the cyclotron?
b) Calculate also the period of the electrons in the circular motion and the frequency of the
accelerating electric eld.
The mass of an electrons is 9.11 ∗ 10−31 kg .
5
6. 38. A 20 m long wire with 12 A current is going from East to West in the Earth's magnetic eld
55µT . Calculate the force acting on the wire due to the magnetic eld.
39. In a DC motor a 10 A current is going through a coil with 300 windings and cross sectional
area 0.6 dm2 . Magnetic eld of the motor is 0.5 T. The motor is running at 600 RPM. Graph
the torque during 0-5 seconds. What is the maximum value of the torque?
40. The coil of a DC motor has a resistance of 2.0 Ω. The motor is running by a battery of 12 V
and an inertial resistance of 0.5 Ω.Calculate:
a) the current at the moment the motor is started;
b) the current when the motor is running at 600 RPM, when there is a counted EMF of 10
V in the coil.
41. Calculate the magnetic eld at 10 cm distance of a wire with DC of 100 A.
42. Calculate the magnetic eld in the center of a current loop with radius of 20 cm. The current
is 0.6 A.
43. Calculate the magnetic eld inside a 10 cm long coil with 300 windings. The coil has an iron
core. Relative permeability of iron is 1200. Current through the col is 3.0 A.
44. A 2000 turn solenoid of length 40 cm and resistance 16 Ω is connected to a 20 V supply.
What is the ux density at the mid point of the axis of the solenoid?
45. A long wire (X) carrying a current of 30 A is placed parallel to, and 3.0 cm away from, a
similar wire (Y) carrying a current of 6.0 A. What is the ux density midway between the
wires:
a) when the currents are in the same direction;
b)when they are in opposite direction;
c) when the currents are in the same direction there is a point somewhere between X and Y
at which the ux density is zero. How far from X is this point?
Magnetic induction, AC generators
46. A conductor rod (length 80 cm) is moving perpendicular to a magnetic eld of 5.0 T with a
speed of 20 m/s. Calculate the induced EMF between the ends of the road.
47. The magnetic elds inside a coil (length 10 cm, cross section area 8 cm * 8 cm, 500 windings)
increases uniformly from 0 to 0.5 T in 2 s. Calculate the induced EMF in the coil.
48. A coil with 1200 windings rotates with a frequency of 100 Hz in a magnetic eld of 2.0 T.
Calculate the induced EMF if the cross section area of the coil is 1.2 dm2 .
49. In a hydroelectric power plant a cylinder (height 1.8 m, radius 2.0 m) with columns of
electromagnets rotates slowly in a way, that the north poles (followed by south poles) pass
by a 1.8 high iron rod 50 times per second. The magnetic eld of the poles is 10 T. There
are 25 rows of North-South pairs on the surface of the cylinder. Calculate the EMF created
in the rod.
6
7. Self inductors and transformers
50. Calculate the inductance of a coil with 1200 windings, length of 10 cm and cross sectional
area 1.2 dm2 . Calculate the value also when there is an iron coil inside (for iron κ = 1000).
51. Calculate:
a) the resistance of the copper wires between Helsinki and Rovaniemi (2*800 km). The
diameter of the wire is 2.5 cm.
b) the power loss and voltage loss in the wires if 250 M W is transferred from Rovaniemi to
Helsinki using 400 kV .
52. An engine needs 220 V , 4.0 kV electric power. The power is brought to the engine from a
nearby power station with 1.5 Ω wires. Calculate:
a) the power loss in the wires and the EMF needed in the generator if transformers are not
been used;
b) the power loss and EMF in the case that there is two similar ideal transformers in the
both ends. The transformers have 33 windings in the primary coil and 660 windings in the
secondary coil.
53. A 12 V battery, a switch, a 4 Ω resistors and a 2 H coil are in series forming a closed circuit.
Calculate:
a) the current I at the moment the circuit is closed (switch is turned on);
b) the nal current in the circuit;
c) the time constant of the circuit;
d) the value of the time derivative I'(t) when the current is 1.5 A.
54. A coil with an inductance of 20 H and a resistance of 10 Ω is connected in series with a
battery of EMF 12 V and a switch. What is:
a) the rate of change of current immediately after the switch is closed;
b) the nal current;
c) the current after 3.0 S ;
d) how long after the switch is closed will the current be 0.4 A.
55. A coil with a resistance of 6.0 Ω and an inductance of 30 mH is connected to a 12 V supply.
What is the energy stored in the coil when the current has reached its equilibrium value?
56. A farmer installs a private hydroelectric generator to provide power for equipment rated at
120 kW 240 V AC. The generator is connected to the equipment by two conductors which
have a total resistance of 0.2 Ω. The system is shown schematically in the gure below.
a) The equipment is operating at its rate power. Calculate:
(i) the power loss in the cables;
(ii) the voltage which must be developed by the generator;
(iii) the eciency of the transmission system.
b) An engineer suggest that the farmer uses a transformer to convert the generator output
to give a PD of 2400 V at the end of the transmission line, as shown in the next gure. A
second transformer is to be used to step down this PD to 240 V .
7
8. (i) Explain briey how a transformer makes use of electromagnetic induction to produce an
output voltage several times bigger than the input voltage.
(ii) The transformer are 100 % ecient. Calculate the power loss in the new transmission
system.
Three phase current
57. Calculate the current in the neutral line, if:
a) all the phased are loaded equally;
b) current taken from phases A,B and C are 10 A, 12 A and 15 A.
58. The peak value of the voltage in all three phases is 155.6 V . Calculate:
a) the eective phase voltage (voltage between a phase and neutral line);
b) the eective voltage that can be taken between two phase lines.
AC circuits
59. An 24 V AC power supply with adjustable frequency and a 100 Ω resistors are in series.
Calculate the current when:
a) 50 Hz frequency is used;
b) 500 Hz frequency is used.
60. An 24 V AC power supply and a 0.2 H coil with negligible resistance are in series. Calculate
the current when:
a) 50 Hz frequency is used;
b) 500 Hz frequency is used;
c) 5.0 kHz frequency is used.
61. An 24 V AC power supply and a 4 µF capacitor are in series. Calculate the current when:
a) 50 Hz frequency is used;
b) 500 Hz frequency is used;
c) 5.0 kHz frequency is used.
62. An 24 V AC power supply, a 100 Ω resistors, 2.0 H coil and 4 µF capacitor are in series.
Calculate:
a) the frequency that gives the largest value for the current. What is the value of the current
in that case?
b) the current and the phase angle when 500 Hz frequency is used.
63. Calculate the value of the capacitor needed when 96.7 M Hz radio program is received. The
coil used in the receiving circuit has 2.0 µH inductance.
64. A 47.0 µF capacitor and a resistor of resistance 30.0 Ω are connected in series. The pair are
connected across a 50 Hz supply with a peak value of 100 V . Find:
a) the reactance of the capacitor;
b) the impedance of the circuit;
8
9. c) the peak value of the current in the circuit;
d) the peak value of the PD across the capacitor;
e) the peak value of the PD across the resistor.
65. A resistor of resistance 120 Ω, a capacitor of capacitance 22 µF and a coil with a resistance of
10 Ω and an inductance of 300 mH are connected in series with a 100 Hz alternating supply.
Find:
a) the impedance of the circuit;
b) the angle by which the applied PD leads the current.
66. A 20 µF capacitor and a 100 Ω resistor are connected in series with a 240 V RMS 50 Hz
supply. Calculate:
a) the reactance of the capacitor;
b) the impedance of the circuit;
c) the RMS current;
d) the average power.
67. A 47 µF capacitor and a 2 mH inductor with a resistance of 100 Ω are connected in series
with a 50 V RMS supply. What is:
a) the resonant frequency of the circuit;
b) the average power consumed at this frequency (Note: you should be able to do part (b) in
your head!).
68. A 60 W light bulb, designed for use with a 120 V supply, may be operated at the correct
rating from a 240 V , 50 Hz supply by connecting it in series with a resistor, as shown in
gure below.
a) Calculate, for normal working conditions,
(i) the current owing in the lamp
(ii) the resistance R of the lamp
(iii) a value for a suitable series resistor.
b) The same lamp may also be operated at the correct rating from the 240 V , 50 Hz supply
by connecting it in series with a capacitor as shown in the next gure.
(i) Write down an expression for the impedance of the circuit containing the lamp and the
capacitor of reactance Xc
9
10. (ii) Calculate the value for Xc
(iii) Calculate a value for the capacitance of the capacitor.
(c) By considering the power dissipate in each circuit explain which circuit provides the better
solution.
69. A is a coil having a low resistance and a high inductance.
A resistor B has the same resistance as A, but negligible
inductance. C and D are identical lament lamps and the
battery can be assumed to have negligible resistance.
a) Describe and explain how the appearance of each lamp
changes in the period after the switch S is closed.
b) The DC battery is replaced by a sinusoidal alternating
source of RMS potential dierence 9 V olts and negligible
impedance. Describe and explain the appearance of each
lamp after S is closed.
70. In the circuit,the source has negligible internal impedance. Find:
a) the RMS current in the circuit;
b) the mean rate of production of heat.
71. A tuning capacitor is to be used with a 10 mH inductor in an LC circuit of a radio to provide
tuning of all stations broadcasting in the band from 500 kHz to 1.50 M Hz .
a) The largest value of capacitance required is 10.1 pF . What is the smallest value used?
b) The capacitor is to be made as shown in the diagram using two semi-circular plates which
are separated by an air gap of 1.00 mm.
Calculate the diameter of the plates required. Permittivity of air = 8.9 ∗ 10−12 F m−1
c) State two ways of designing the capacitor so that the diameter can be reduced whilst giving
the same maximum capacitance.
d) To change the range of tuning capacitance a 22 pH capacitor is connected in series with
the variable capacitor. What is the new maximum capacitance?
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11. 72. A series LCR circuit is set up as shown below. The frequency of the source S (of zero
impedance) is 1000 Hz .
2π
Calculate for the circuit:
a) the impedance;
b) the RMS current;
c) the power dissipate.
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12. Electrostatics
1. 0.27 mN ; 2. 1.7 ∗ 10−7 N ; 3. 7.6 kV /m; 6. a)14.18 M m/s b)14.50 M m/s c)n 2.3%; 7.
1.0 M m/s; 8. a)14.4 kV b)yes; 9. a)3.6 ∗ 106 V b)7.8 ∗ 107 N C −1 at 90o to AB, directed away from AB;
10. a)6.0 ∗ 105 V b)7.2 ∗ 105 V c)7.2 ∗ 105 V ; 11. 54 kV /m 13 mJ/m3 ; 12. 75 kV /m; 13.
18.7 M m/s.
DC circuits
14. a)5 nC/m2 b)n 565 V /m c)35 pF d)300 V e)1.6 µJ ; 16. 3.6 GV 27 µC/m2 ; 17. a)18.3 V ,
0.16 A b)0.179 A, 39.4 W ; 18. resistance 45 Ω resistivity 49 ∗ 10−8 Ωm; 19. 0.54 J ; 20. a)
current 0.13 A, power outputs 20.3 W and 8.2 W = together 28.5 W ; 23. 8.0 A; 24. 5.1 ∗ 10−5 Ω;
25. a)2.0 A b)2 A; 26. 3.5 ∗ 102 Ω; 27. 1.7 Ω; 28. a)1.5 A b)1.2 Ω; 29. a)0.50 Ab)2.5 W
c)0.50 W ; 30. 36 µC (3.0 µF ), 60 µC (5.0 µF ); 31. a) 36 µC (X), 36 µC (Y), 24 µC (Z) b) 9 V (X),
3 V (Y), 12 V (Z); 32. a)48 µC on each b)12 V (4.0 µF ), 8.0 V (6.0 µF ); 33. a)30.0 µA b)24.6 µA;
34. 13.3 µC ; 35. a)4 µC on each b)2 µC (M), 8 µC (N).
Magnetic elds
36. 50227 m; 37. a)88 M m/s b)7 ns; 38. 13 mN ; 39. max torque 9 N m; 40. a)24 A
b)4 A; 41. 0.2 mT ; 42. 18.8 µT ; 43. 13.6 T ; 44. 7.9 ∗ 10−3 T ; 45. a)3.2 ∗ 10−4 T b)4.8 ∗ 10−4 T
c)2.5 cm.
Magnetic induction, AC generators
46. 80 V ; 47. 0.8 V ; 48. peak value 18 kV ; 49. peak value 453 V .
Self inductors and transformers
50. 217 H ; 51. a)55 Ωb)22 M W ; 52. a) 497 W , 247 V b) 1.24 W , 220 V ; 53. a)0 A b)3 A
c)0.5 s d)3 A/s; 54. a)0.60 As−1 b)1.2 A c)0.93 A d)0.81 s; 55. 60 mJ ; 56. a) (i)50 kW (ii) 340 V
(iii) 70.6 % b) (ii)500 W .
Three phase current
57. a)0 A b)4.4 A; 58. a)110 V b)191 V .
AC circuits
59. 0.24 A; 60. a)380 mA b)38 mA c)3.8 mA; 61. a)30 mA b)300 mA c)3 A; 62. a)
56 Hz , 0.24 A b) 3.9 A, 89o ; 63. 1.4 pF ; 64. a)67.7 Ω b)74.1 Ω c)1.35 A d)91.4 V e)40.5 V ;
65. a)174 Ω b)41.8o ; 66. a)159 Ω b)188 Ω c)1.28 A d)163 W ; 67. a)519 Hz b)25 W ; 68.
a) (i)0.50 A (ii) 240 Ω (iii) 240 Ω b) (ii)416 Ω (iii) 7.7 µF ; 70. a)47.2 A b)8.91 ∗ 103 W ; 71.
a)1.13 pF b)5.4 cm d)6.9 pF ; 72. a)141 Ω b)0.20 A c)4.0 W .
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