Lecture 13 2 26 2004
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Magnetism is caused by the alignment of atoms' spins and orbits within materials like iron, nickel, and cobalt. Magnetic fields are produced by moving electric charges. In magnetic materials, the atomic spins and orbits align into regions called domains that can be oriented by an external magnetic field. Electric currents produce magnetic fields, and changing magnetic fields induce electric currents based on Faraday's law of induction. This principle is exploited in devices like generators, transformers, and motors.
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This kind of Van de Graaff generator is made up of:
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The strong negative charge from the roller now begins to do two things:
1. It repels the electrons near the tips of the lower brush assembly.
2. It begins to strip nearby air molecules of their electrons.
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Atoms contain protons, electrons, and neutrons. Protons are positively charged, electrons are negatively charged, and they are located on the outer edges of atoms. The movement and concentration of electrons creates static electricity and electric currents. Static electricity builds up a charge without flowing, while electric current flows from high voltage to low voltage, such as through wires in a circuit. Current can be direct (DC) or alternating (AC). Magnets have north and south poles and magnetic fields that interact with electric fields through electromagnetic induction, which is the basis for technologies like electric motors, generators, and transformers.
Power point electricity and magnetism (4)
Magnets have north and south poles and like poles repel while unlike poles attract. There are permanent magnets made from iron alloys and electric magnets created by running current through a coil of wire. The magnetic field around a magnet gets weaker with distance from its poles. Electromagnets are useful because their poles can be reversed by switching current direction. Motors use electromagnets and permanent magnets to convert electrical energy to mechanical motion via electromagnetic induction. Generators operate on the same principles but convert mechanical motion to electrical energy. Transformers increase or decrease voltage in power grids to safely deliver electricity to homes.
Magnetism
This document provides an overview of magnetism and electromagnetism. It discusses magnetic poles and fields, induced magnetism through electromagnetic induction, and how generators produce alternating current. Moving a magnet or conductor in a magnetic field can induce electric currents according to Faraday's law of induction. The strength of magnetic fields depends on factors like the current flowing and number of wire loops or turns.
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This document provides an overview of teaching electromagnetism, including describing permanent magnets and induced magnetism, magnetic fields from moving charges, how transformers and motors work, and Lenz's law of electromagnetic induction. It discusses challenges in teaching concepts like magnetic fields and the operation of motors. Key experiments are outlined to demonstrate topics like electromagnets, induction, and transformers. Common student misconceptions are also addressed.
Mag-electromag.ppt
This document provides an overview of teaching electromagnetism, including describing permanent magnets and induced magnetism, magnetic fields from moving charges, how transformers and motors work, and Lenz's law of electromagnetic induction. It discusses challenges in teaching concepts like magnetic fields and the operation of motors. Key experiments are outlined to demonstrate topics like electromagnets, induction, and transformers. Common student misconceptions are also addressed.
Mag-electromag.ppt
This document provides an overview of teaching electromagnetism, including describing permanent magnets and induced magnetism, magnetic fields from moving charges, how transformers and motors work, and Lenz's law of electromagnetic induction. It discusses challenges in teaching concepts like magnetic fields and the operation of motors. Key experiments are outlined to demonstrate topics like electromagnets, induction, and transformers. Common student misconceptions are also addressed.
Mag-electromag.ppt
oday, the Lok Sabha, apart from introducing the Electricity (Amendment) Bill, 2022 and will take up two more Bills — the Energy Conservation (Amendment) Bill, 2022 and the New Delhi International Arbitration Centre (Amendment) Bill, 2022 — for discussion, considering and passing. The Rajya Sabha is scheduled to discuss the Central Universities (Amendment) Bill, 2022 for considering and passing.
Live updates:
electromag.ppt
description about electromagnetic field strength exposure to how it's effect at human body and what is the standard value assign in the world according to generations, it's also related to manufacturer equipment, as well depend on area population , the exposure of electromagnetic propagation is probational to antenna height and input power of the antenna
Principles of electromagnetic induction (emi) in
This document discusses the principles of electromagnetic induction in recording systems. It explains that in magnetic recording, an input audio or video signal is converted to electrical signals by transducers like microphones. It is then recorded by a magnetic recorder as a magnetic pattern on a medium like tape or a disc. During playback, the moving magnetic medium induces electrical currents in the recorder head, which are amplified and sent to speakers or monitors to recreate the audio or video output.
Lecture 8 2_magnetic_force
Magnetism is produced by magnets which have north and south poles. Unlike poles attract and like poles repel. The Earth itself acts like a giant magnet due to its nickel-iron core. Magnetic substances are composed of small regions called domains that align when exposed to magnetic fields. Electricity and magnetism are related because electric currents produce magnetic fields. Electromagnets are coils of wire that produce strong magnetic fields when electric current passes through. Galvanometers use electromagnets to measure electric current. Electric motors convert electrical energy to mechanical motion using electromagnetic induction. Direct current flows in one direction from a battery, while alternating current periodically reverses direction from a generator.
Lecture 12
1) Magnetism is caused by the motion of electric charges such as electrons spinning in atoms. Permanent magnets form when many atomic magnetic fields are aligned.
2) Magnetic fields have north and south poles and flow from the north pole to the south pole both inside and outside the magnet. Magnetic field strength is represented by closer field lines.
3) Moving electric charges create magnetic fields, so electric currents generate magnetic fields that wrap around the wire. This is the basis of electromagnets, electric motors, generators, and transformers.
electromagnetismstuver-100519163133-phpapp01.pdf
This document discusses electromagnetism and how electricity can be generated using magnetism. It explains that electricity and magnetism are closely linked, and that a magnetic field can induce a current in a conducting wire. It then discusses how a magnet moving in and out of a coil of wire can generate an alternating current through electromagnetic induction. It also explains how step-up and step-down transformers can change voltage levels to efficiently transmit electricity over long distances on the national power grid.
Magnets and magnetism
This document provides an overview of basics of electrical engineering, specifically focusing on magnets and magnetism. It defines different types of magnets including permanent magnets, temporary magnets, and electromagnets. It describes magnetic domains, magnetic dipoles, magnetic fields, flux, and various laws of magnetism including Biot-Savart law, Ampere's law, force law, and Faraday's law. It also discusses applications such as solenoids, transformers, and generators.
Unit 35 Magnetism And Magnetic Fields
This document discusses magnetic forces and fields. It describes three types of magnets: ferromagnetic, paramagnetic, and electromagnets. An electromagnet becomes magnetic under the influence of electric current flowing through a wire and is the basis for electric motors. The Earth acts as a giant electromagnet due to electric currents in its liquid outer core generating a magnetic field, which protects us from solar particles and causes the aurora borealis.
Electromagnetic induction
Electromagnetic induction builds on the concept of magnets and magnetic fields in grade 10. Most of the work covered here is quite clear and straight forward.
magnetism-170505155017.pdf.pptx.........
Magnets have north and south poles and magnetic fields that emerge from the north pole and return through the south pole. Molecular theory states that magnetism arises from electron orbits within molecules acting as tiny molecular magnets that are aligned in magnetized materials. An electric current flowing through a wire produces a circular magnetic field around it according to the right-hand rule. A coil of wire with current induces a magnetic field within it with field lines parallel to its axis. Electromagnets use this principle, with a solenoid wrapped around an iron core that becomes magnetized when current flows through the coil.
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Lecture 13 2 26 2004
- 1. Magnetism Similar to electric forces Magnetic Poles North and South Poles Historic Designations Like Poles Repel, Unlike Poles Attract Due to alignment of atoms in material
- 2. Magnetic Fields Similar to electric and gravitational fields Magnetic fields are produced by the MOTION of electric charges
- 3. Magnetic Fields Revolving electron produces field Spinning electron produces field In most atoms, combination of spins and orbits are in opposite directions The fields cancel each other out Some atoms, they don’t cancel Iron, nickel, cobalt, aluminum
- 4. Magnetic Domains In iron, for example, field by an atom is so strong it causes neighboring atoms to arrange their spins and orbits to line up These clusters form magnetic domains Domains are randomly oriented in ordinary iron, nickel, etc. Can force them to line up with external field
- 5. Electric Currents & Magnetism A moving charge produces a magnetic field
- 6. Electric Currents & Magnetism
- 7. Electromagnetics Place a piece of unmagnetized iron in a coil of wire carrying a current Produce a strong magnetic field in the iron by lining up domains Makes the whole thing a very powerful magnet
- 8. Magnetic Forces and Charges If a charge isn’t moving, a magnetic field has no effect on the charge Reciprocal kind of idea Moving charges produce magnetic fields Magnetic fields apply a force to a moving charge
- 9. Magnetic Forces and Charges
- 10. Magnetic Forces and Charges
- 11. Magnetic Forces and Charges
- 12. Meters Use a compass needle (magnet)
- 13. Meters
- 14. Motors
- 19. Electromagnetic Induction Faraday’s Law The induced voltage in a coil is proportional to the number of loops, multiplied by the rate at which the magnetic field changes within those loops. The amount of current depends on the resistance of the wire Changing magnetic field in a loop is key!!
- 20. Electromagnetic Induction Traffic light control (buried loops) Airport Security Systems Mag strips on credit cards Tape Recorders Computer Hard Drives
- 21. Generators
- 22. Generators
- 23. Power Production
- 24. Transformers
- 25. Transformers The more turns, the more voltage induced Step-up Transformer has more turns in secondary than in primary Step-down Transformer has more turns in primary than in secondar
- 26. Transformers Energy Conservation Power In = Power Out
- 27. Field Induction An electric field is induced in any region of space in which a magnetic field is changing with time A magnetic field is induced in any region of space in which an electric field is changing with time “Let there be light!!!”