Unit 7
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This document provides an overview of magnetism and how it relates to electricity. It discusses how magnets are used in everyday devices like refrigerators and credit cards. It explains that a magnetic field is the space around a magnet where its force can be detected, such as with iron filings. It also describes how magnetic poles attract or repel each other and how the Earth itself acts as a large magnet. Furthermore, it outlines how electricity and magnetism are related through electromagnets and how moving a magnet in and out of a coil can generate electricity.
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Magnetism e
The document discusses the earth's magnetic field and how it protects the planet. It describes how the earth's magnetic field deflects charged particles from the sun's wind away from earth, protecting life and infrastructure. These particles enter the magnetic field at the poles, where the field is strongest, and collide with gas molecules, ionizing them and causing them to emit light in the form of the auroras.
Magnetism
Magnets produce magnetic fields and have north and south poles. Opposite poles attract while like poles repel. Magnets work through magnetic domains within ferromagnetic materials which align to produce an overall magnetic field. Different materials have different magnetic properties depending on their composition and structure.
Electric currents, magnetic fields
Electric currents produce magnetic fields that form circular patterns around the wire. Reversing the current also reverses the direction of the magnetic field. Looping a current-carrying wire intensifies the magnetic field, with more loops producing a stronger field. Electromagnets are created by placing iron inside a coiled wire through which a current is passed, making the iron temporarily magnetic.
Magnetism
This document provides information about magnetism and magnetic fields. It defines key terms like magnetic poles, magnetic force, magnetic field, and different types of magnets. It explains that every magnet has two poles, and that a compass points north because the Earth acts as a giant magnet with its own north and south poles. Cutting a magnet in half will result in two smaller magnets, each with their own north and south poles.
Magnetism
1. 1. Magnetism Name Of Student..
2. 2. Sub-Heading 1.) Magnet Definition. 2.) How Magnet Works. 3.) Coulomb Law Of Magnetic Force. 4.) Magnetism. 5.) Explanation Of Magnetism. 6.) Magnetic Field. 7.) What Happens If We Broke Magnet. 8.) Magnetic Domains. 9.) Magnetizing Material. 10.) Types Of Magnetism.
3. 3. Definition: Magnets:- A magnet is any material that produces a magnetic force (Push or Pull) on a magnetic material ( such as iron etc ). E.G:-
4. 4. How Magnet Works:- • Every Magnet Has Two Poles:- 1.) North Pole. 2.) South Pole. The opposite poles attract each other while same poles repel each other. E.G:-
5. 5. Coulomb Law Of Magnetic Force:- Sir Charles Augustine de Coulomb, was first to recognized the quantitatively force exerted by the magnets and he stated that:- “The magnitude of the electrostatic force of attraction between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them. The force is along the straight line joining them.” 𝐹𝑒 = 𝑘𝑞1 𝑞2 𝑟2
6. 6. Magnetism:- • Definition:- Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel other objects.
7. 7. Explanation:- A magnetic field exerts a force on particles in the field due to the Lorentz Force. As Lorentz Force is defined as:- “The force which is exerted by a magnetic field on a moving electric charge.” The motion of electrically charged particles gives rise to magnetism. The force acting on an electrically charged particle in a magnetic field depends on the magnitude of the charge, the velocity of the particle, and the strength of the magnetic field.
8. 8. Magnetic Fields:- Diagram:- • The Lines around the magnet shows area of force exerted in a region around magnet. • The forces originates from the North Pole and moves towards South Pole.
9. 9. What Happens If We Broke Magnet:- • If we broke a magnet into pieces then each piece will still have its own North Pole and South Pole and each field have its own magnetic field.
10. 10. Magnetic Domains:- • The magnetic fields in the magnets is produced by the spinning of their electrons. • These spinning of electron create tiny magnetic regions which are known as Magnetic Domains. • In Other atoms these magnetic regions (Domains) cancels each other while in magnets Domains are all lined up in a same directions. • When ever all electrons spin in a same direction magnetic field is created between them.
5 magnetism
Magnetism involves the properties and interactions of magnets. All magnets have a north and south pole, with opposite poles attracting and like poles repelling. The magnetic force between two magnets increases as they move closer together and decreases as they move apart. Magnetic poles are the regions of strongest magnetic force exerted by a magnet. The Earth has an imaginary bar magnet running through it, with its south magnetic pole near the geographic north pole, causing compasses to point north. Materials like iron, nickel and cobalt contain magnetic domains that can align with an external magnetic field, magnetizing the material. Permanent magnets create their own persistent magnetic field, while temporary magnets only act magnetized when within a strong external field
Magnetism
Magnetism allows certain objects called magnets to exert forces on each other without touching. A magnetic field is a region of space where a magnet will experience a non-contact force. Magnets have two poles, a north and south pole, where like poles repel and opposite poles attract. The Earth also has a magnetic field that protects us from charged particles from the sun and allows compasses to work by pointing to magnetic north.
power point presentation on Magnetism for ICSE class IX students
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The document discusses the earth's magnetic field and how it protects the planet. It describes how the earth's magnetic field deflects charged particles from the sun's wind away from earth, protecting life and infrastructure. These particles enter the magnetic field at the poles, where the field is strongest, and collide with gas molecules, ionizing them and causing them to emit light in the form of the auroras.
Magnetism
Magnets produce magnetic fields and have north and south poles. Opposite poles attract while like poles repel. Magnets work through magnetic domains within ferromagnetic materials which align to produce an overall magnetic field. Different materials have different magnetic properties depending on their composition and structure.
Electric currents, magnetic fields
Electric currents produce magnetic fields that form circular patterns around the wire. Reversing the current also reverses the direction of the magnetic field. Looping a current-carrying wire intensifies the magnetic field, with more loops producing a stronger field. Electromagnets are created by placing iron inside a coiled wire through which a current is passed, making the iron temporarily magnetic.
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This document provides information about magnetism and magnetic fields. It defines key terms like magnetic poles, magnetic force, magnetic field, and different types of magnets. It explains that every magnet has two poles, and that a compass points north because the Earth acts as a giant magnet with its own north and south poles. Cutting a magnet in half will result in two smaller magnets, each with their own north and south poles.
Magnetism
1. 1. Magnetism Name Of Student..
2. 2. Sub-Heading 1.) Magnet Definition. 2.) How Magnet Works. 3.) Coulomb Law Of Magnetic Force. 4.) Magnetism. 5.) Explanation Of Magnetism. 6.) Magnetic Field. 7.) What Happens If We Broke Magnet. 8.) Magnetic Domains. 9.) Magnetizing Material. 10.) Types Of Magnetism.
3. 3. Definition: Magnets:- A magnet is any material that produces a magnetic force (Push or Pull) on a magnetic material ( such as iron etc ). E.G:-
4. 4. How Magnet Works:- • Every Magnet Has Two Poles:- 1.) North Pole. 2.) South Pole. The opposite poles attract each other while same poles repel each other. E.G:-
5. 5. Coulomb Law Of Magnetic Force:- Sir Charles Augustine de Coulomb, was first to recognized the quantitatively force exerted by the magnets and he stated that:- “The magnitude of the electrostatic force of attraction between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them. The force is along the straight line joining them.” 𝐹𝑒 = 𝑘𝑞1 𝑞2 𝑟2
6. 6. Magnetism:- • Definition:- Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel other objects.
7. 7. Explanation:- A magnetic field exerts a force on particles in the field due to the Lorentz Force. As Lorentz Force is defined as:- “The force which is exerted by a magnetic field on a moving electric charge.” The motion of electrically charged particles gives rise to magnetism. The force acting on an electrically charged particle in a magnetic field depends on the magnitude of the charge, the velocity of the particle, and the strength of the magnetic field.
8. 8. Magnetic Fields:- Diagram:- • The Lines around the magnet shows area of force exerted in a region around magnet. • The forces originates from the North Pole and moves towards South Pole.
9. 9. What Happens If We Broke Magnet:- • If we broke a magnet into pieces then each piece will still have its own North Pole and South Pole and each field have its own magnetic field.
10. 10. Magnetic Domains:- • The magnetic fields in the magnets is produced by the spinning of their electrons. • These spinning of electron create tiny magnetic regions which are known as Magnetic Domains. • In Other atoms these magnetic regions (Domains) cancels each other while in magnets Domains are all lined up in a same directions. • When ever all electrons spin in a same direction magnetic field is created between them.
5 magnetism
Magnetism involves the properties and interactions of magnets. All magnets have a north and south pole, with opposite poles attracting and like poles repelling. The magnetic force between two magnets increases as they move closer together and decreases as they move apart. Magnetic poles are the regions of strongest magnetic force exerted by a magnet. The Earth has an imaginary bar magnet running through it, with its south magnetic pole near the geographic north pole, causing compasses to point north. Materials like iron, nickel and cobalt contain magnetic domains that can align with an external magnetic field, magnetizing the material. Permanent magnets create their own persistent magnetic field, while temporary magnets only act magnetized when within a strong external field
Magnetism
Magnetism allows certain objects called magnets to exert forces on each other without touching. A magnetic field is a region of space where a magnet will experience a non-contact force. Magnets have two poles, a north and south pole, where like poles repel and opposite poles attract. The Earth also has a magnetic field that protects us from charged particles from the sun and allows compasses to work by pointing to magnetic north.
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Magnets are used in many applications such as compasses, which use magnetism to point north. Magnets are also found in speakers, motors, and generators, which convert different forms of energy. Magnets can be used for novelty purposes like magnetic levitation or attaching items to refrigerators. Galvanometers also use magnetism to measure electric current and voltage. Electric motors convert electrical energy to mechanical motion using magnets and electromagnetic coils, and generators do the opposite by converting mechanical rotation into electrical energy.
Summary fun with magnets
Magnets can be natural or artificial. Natural magnets are made of magnetite, an iron ore with magnetic properties. Artificial magnets are made from iron, nickel, or cobalt. Magnets have different shapes like bar, horseshoe, cylindrical, or ball. They attract iron, nickel, and cobalt. Magnets have north and south poles and can attract or repel each other depending on whether the poles are opposite or the same.
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Magnets have been known and used for navigation for centuries, with the ancient Greeks using a magnetic stone called magnetite. Magnetism is the force of attraction or repulsion between magnetic materials due to the arrangement of electrons in their atoms. The Earth itself acts as a large magnet, with a magnetic field strongest at its north and south magnetic poles. Other planets and the Sun also have magnetic fields extending into space.
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- Testing a magnet involves bringing each end of a specimen near the north pole of a bar magnet. Attraction indicates a magnetic material, while repulsion indicates a permanent magnet.
- Induced magnetism occurs when an unmagnetized magnetic material like iron becomes magnetized upon contact with a permanent magnet. However, induced magnets only maintain magnetism temporarily.
- The magnetic field is the region around a magnet where other magnetic objects experience a force. Magnetic field lines are used to represent the pattern and direction of this field.
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Magnetism is a force that can attract or repel magnetic materials like iron. It is a property of substances that are attracted to magnets. There are different types of magnetism including permanent magnetism, temporary magnetism caused by magnetic fields, and electromagnetism related to electric currents and changing magnetic fields. Magnets have north and south poles and attract unlike poles while repelling like poles. The strength of magnetic force depends on the strength of the magnets and the distance between them.
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The document discusses key facts about magnets and magnetism. It explains that magnets have north and south poles that attract different poles but repel similar poles. It also notes that while some metals like iron are magnetic, other metals like aluminum are non-magnetic. The document explores different types of magnets and their properties.
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The document discusses magnetism and magnets. It begins by explaining that the ancient Greeks and Romans knew that the mineral lodestone was magnetic and could attract iron. It then provides details on lodestone and other naturally magnetic materials called ferromagnets that strongly attract metals like iron. The document outlines the basic properties of magnets, including that they have north and south poles and opposite poles attract while like poles repel. It concludes by describing different types of magnets such as permanent, temporary, and electromagnets as well as their common shapes.
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The magnetic force occurs between magnets and between magnets and some metals. Magnets have two poles called north and south that attract different poles but repel similar poles. Magnetism is caused by the movement of electric charges like electrons in atoms. Without magnetism, we would not have electricity or electric motors, and many modern technologies like phones, computers, speakers, and earphones would not exist.
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The document discusses magnetic fields and experiments with magnets. It explains that:
- Iron filings can reveal the magnetic field around a magnet by showing the direction of magnetic forces. The region where a magnet exerts influence is called its magnetic field.
- The magnetic field around a bar magnet has strong lines radiating from the North and South poles, getting weaker further away.
- When two magnets with like poles are placed together, they repel each other, while unlike poles attract.
20 magnetism
Magnetism is caused by the alignment of electron spins in atoms. Natural magnets were first discovered in Magnesia, and the Chinese were the first to observe that magnetism could be induced in iron rods near these natural magnets. Michael Faraday established that changing magnetic fields induce electric currents based on electromagnetic induction. This principle led to technologies like generators and transformers that are crucial to modern electricity generation and distribution.
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The document discusses several laws and concepts related to magnetism. It states that like poles of magnets repel each other, while unlike poles attract. A compass arrow points to magnetic north. Induced magnetism explains how magnetic materials can become magnetized when placed near a magnet due to magnetic induction. A magnetic field is the region around a magnet where its magnetic effects can be detected, with field lines running from the north to south pole. Permanent magnets made of steel retain their magnetism while temporary magnets made of iron lose theirs over time.
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Iron particles are lined up when a magnet is brought close to iron. When two bar magnets are placed close together with the same poles facing, they will repel each other. The magnetic field consists of field lines that emerge from the North pole and reenter at the South pole. Magnets are made of iron, nickel, or cobalt. Magnetic materials such as iron and steel are attracted to magnets, while non-magnetic materials like plastic and wood are not. To preserve a bar magnet, it should be stored with another magnet to maintain its magnetic field.
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This document provides an overview of magnetism and magnetic fields. It discusses that magnetism is caused by the motion of charged particles and the strongest force is at the poles. Magnetic fields are represented by lines and form closed loops. Permanent magnets are often made of steel and electrons align to produce magnetic fields. Magnets can lose magnetism through heating, striking, or placing similar poles together. Larger magnets are not necessarily stronger. Maglev trains use magnetic fields for lift, propulsion and guidance.
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There are two types of magnets: permanent magnets that retain magnetic fields indefinitely, and temporary magnets that lose magnetic field strength over time or can be turned on and off. Materials that are naturally magnetic include iron oxide (magnetite/hematite) and some transition metals like iron, nickel, and cobalt. Electromagnets are temporary magnets that become magnetic under the influence of an electric current and are no longer magnetic when the current stops.
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DEPENDENCE OF HIGH TEMPERATURE ON STRENGTH OF MAGNET
The document is a student's certificate, acknowledgements, index, and report on a school science project investigating the dependence of magnetic strength on high temperature. The project involved heating a magnet in an oven and measuring the weight of paperclips attracted at different temperatures. The results showed that magnetic strength initially increased as temperature decreased but then decreased at very low temperatures, as extreme temperatures can destabilize the balance between temperature and magnetic domains in magnetic materials.
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a complete dscription about the types uses and properties of metal in details...... a small 7 slide ppt in which all slides are the best from each oher.......... hope will like my presentation
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Presentation is on explaining concept of magnetism to kids of primary & secondary standards. The PPT is based on magnetism concepts covered in CBSE syllabus.
It helps kids to understand the concept in detail and if its coupled with few practical examples, it will be more fun.
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Summary fun with magnets
Magnets can be natural or artificial. Natural magnets are made of magnetite, an iron ore with magnetic properties. Artificial magnets are made from iron, nickel, or cobalt. Magnets have different shapes like bar, horseshoe, cylindrical, or ball. They attract iron, nickel, and cobalt. Magnets have north and south poles and can attract or repel each other depending on whether the poles are opposite or the same.
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Magnets have been known and used for navigation for centuries, with the ancient Greeks using a magnetic stone called magnetite. Magnetism is the force of attraction or repulsion between magnetic materials due to the arrangement of electrons in their atoms. The Earth itself acts as a large magnet, with a magnetic field strongest at its north and south magnetic poles. Other planets and the Sun also have magnetic fields extending into space.
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- Testing a magnet involves bringing each end of a specimen near the north pole of a bar magnet. Attraction indicates a magnetic material, while repulsion indicates a permanent magnet.
- Induced magnetism occurs when an unmagnetized magnetic material like iron becomes magnetized upon contact with a permanent magnet. However, induced magnets only maintain magnetism temporarily.
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Magnetism is a force that can attract or repel magnetic materials like iron. It is a property of substances that are attracted to magnets. There are different types of magnetism including permanent magnetism, temporary magnetism caused by magnetic fields, and electromagnetism related to electric currents and changing magnetic fields. Magnets have north and south poles and attract unlike poles while repelling like poles. The strength of magnetic force depends on the strength of the magnets and the distance between them.
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The document discusses how to build a simple electromagnet using copper wire wrapped around an iron nail, connected to a battery. When electric current flows through the wire, it creates a magnetic field that allows the nail to attract iron filings. The strength of an electromagnet depends on factors like the number of wire turns and amount of electric current. Electromagnets are found in many devices and have various applications because they can be switched on and off using electricity unlike permanent magnets.
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The document discusses key facts about magnets and magnetism. It explains that magnets have north and south poles that attract different poles but repel similar poles. It also notes that while some metals like iron are magnetic, other metals like aluminum are non-magnetic. The document explores different types of magnets and their properties.
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The document discusses magnetism and magnets. It begins by explaining that the ancient Greeks and Romans knew that the mineral lodestone was magnetic and could attract iron. It then provides details on lodestone and other naturally magnetic materials called ferromagnets that strongly attract metals like iron. The document outlines the basic properties of magnets, including that they have north and south poles and opposite poles attract while like poles repel. It concludes by describing different types of magnets such as permanent, temporary, and electromagnets as well as their common shapes.
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The magnetic force occurs between magnets and between magnets and some metals. Magnets have two poles called north and south that attract different poles but repel similar poles. Magnetism is caused by the movement of electric charges like electrons in atoms. Without magnetism, we would not have electricity or electric motors, and many modern technologies like phones, computers, speakers, and earphones would not exist.
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The document discusses magnetic fields and experiments with magnets. It explains that:
- Iron filings can reveal the magnetic field around a magnet by showing the direction of magnetic forces. The region where a magnet exerts influence is called its magnetic field.
- The magnetic field around a bar magnet has strong lines radiating from the North and South poles, getting weaker further away.
- When two magnets with like poles are placed together, they repel each other, while unlike poles attract.
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Magnetism is caused by the alignment of electron spins in atoms. Natural magnets were first discovered in Magnesia, and the Chinese were the first to observe that magnetism could be induced in iron rods near these natural magnets. Michael Faraday established that changing magnetic fields induce electric currents based on electromagnetic induction. This principle led to technologies like generators and transformers that are crucial to modern electricity generation and distribution.
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The document discusses several laws and concepts related to magnetism. It states that like poles of magnets repel each other, while unlike poles attract. A compass arrow points to magnetic north. Induced magnetism explains how magnetic materials can become magnetized when placed near a magnet due to magnetic induction. A magnetic field is the region around a magnet where its magnetic effects can be detected, with field lines running from the north to south pole. Permanent magnets made of steel retain their magnetism while temporary magnets made of iron lose theirs over time.
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Iron particles are lined up when a magnet is brought close to iron. When two bar magnets are placed close together with the same poles facing, they will repel each other. The magnetic field consists of field lines that emerge from the North pole and reenter at the South pole. Magnets are made of iron, nickel, or cobalt. Magnetic materials such as iron and steel are attracted to magnets, while non-magnetic materials like plastic and wood are not. To preserve a bar magnet, it should be stored with another magnet to maintain its magnetic field.
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This document provides an overview of magnetism and magnetic fields. It discusses that magnetism is caused by the motion of charged particles and the strongest force is at the poles. Magnetic fields are represented by lines and form closed loops. Permanent magnets are often made of steel and electrons align to produce magnetic fields. Magnets can lose magnetism through heating, striking, or placing similar poles together. Larger magnets are not necessarily stronger. Maglev trains use magnetic fields for lift, propulsion and guidance.
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Magnetism is a property of a material that enables to attract or repel other materials. The presence and strength of the material’s magnetic properties can be observed by the effect of the forces of attraction and repulsion on other materials.
What makes magnets?
Magnets are actually created by tiny spinning electrons in an atom. The electrons move about the nucleus and spin like a top, creating a tiny magnetic field.
If electrons are spinning in the same direction there is more magnetism, while electrons spinning in opposite directions cancel out each others’ magnetic fields. Magnetic fields are invisible, we can only see the effects of the magnetic force.
Magnetic Field: The space around a magnet in which a magnetic force is exerted
— The shape of a magnetic field is revealed by magnetic field lines
Directed away from north poles and toward south poles
Magnets have two ends or poles, called north and south poles. At the poles of a magnet, the magnetic field lines are closer together.
The magnetic field lines around horse-shoe and disk magnets are closest together at the magnets’ poles. Unlike poles of magnets attract each other and like poles of magnets repel. Magnetic Poles: A region on a magnet which produces magnetic forces
The poles of a suspended magnet will align themselves to the poles of the Earth
Fundamental Rule: Like poles repel; opposite poles attract
If a force of attraction only is possible between an object and a magnet, then the object interacting with the magnet contains a ferromagnetic substance and is considered naturally magnetic.
If a force of repulsion is only between an object and a magnet, then the object interacting with the magnet may also be a permanent magnet or a temporarily magnetized ferromagnetic material.
Materials which are attracted by a magnet are known as magnetic materials. Iron, cobalt, nickel and many alloys of these metals like steel and alnico are magnetic.
Magnetic materials can be used to make permanent or temporary magnets unlike the non-magnetic materials which cannot.
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The process by which the screws become magnets is called Electric/Magnetic Induction. This same process is the reason why magnets attract non-magnetized magnetic substances such as the screw. The screw becomes an induced magnet with the end nearer the magnet having an opposite polarity to that of the permanent magnet. Hence attraction happens after magnetic induction occurs. The quicker way to know the polarity of a permanent or induced magnet is by the use of a magnetic compass. Compass needle is a small magnet that is free to pivot in a horizontal plane about an axis and that the end of the magnet that points to geographic north is called the north (N) pole. Likewise, the opposite end of the magnet is the south (S) pole.What are magnetic domains?
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1. Electricity and magnetism are branches of physics that deal with charges in motion and observations relating to electricity and magnetism respectively.
2. A magnet is a body that attracts small pieces of iron and points toward the north-south direction when suspended freely. It has a north pole and a south pole. Like poles repel each other, while unlike poles attract.
3. Electromagnetism is produced when an electric current passes through a coil surrounding a magnetic material like iron. Electromagnets have many applications and their strength depends on factors like the current and number of turns in the coil.
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2. An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current through a coil. The strength of the magnetic field can be increased by using an iron core inside the coil.
3. Electric bells use an electromagnet with a soft iron core. When the button is pressed, current flows through the electromagnet's coil, magnetizing the core and attracting an armature which strikes a bell to produce sound. Releasing the button stops current flow and resets the system.
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The document provides an overview of magnetism and electromagnetism, describing the properties of magnets including magnetic materials, poles, attraction and repulsion of poles, and how electromagnets work using coils of wire and electric current. It also discusses magnetic fields and how they can be observed using iron filings or small compasses, as well as different types of magnets such as bar magnets and horseshoe magnets.
Magnetism f.khadaad
1. Magnets can be natural or artificial. Natural magnets are made of the mineral magnetite while artificial magnets are usually made of steel or iron alloys.
2. All magnets have two poles - a North pole and a South pole. The magnetic force is strongest at these poles. A basic law of magnetism is that like poles repel each other while unlike poles attract.
3. Electromagnets are magnets that are temporarily magnetized by running an electric current through a coil of wire wrapped around an iron core. They are used in many electrical devices such as electric bells, telephones, loudspeakers, and industrial lifting magnets.
simple phenomena of magnetism
This document discusses the basic properties and phenomena of magnetism. It describes how magnets have magnetic fields and two poles (north and south) that attract or repel each other. Magnetic materials like iron and steel can be magnetized by magnets, while non-magnetic materials are unaffected. The magnetic fields of magnets can be visualized using iron filings or a plotting compass. The Earth also has a magnetic field like a bar magnet. Electromagnets produce magnetic fields when electric currents flow through their coils, unlike permanent magnets.
Magnetism and electromagnetism
This document provides information about magnetism and electromagnetism. It discusses the poles of magnets, magnetic materials like iron, induced magnetism through magnetic induction, and how electromagnets can be created using coils of wire and electric current. Examples of applications that use electromagnets are also described, such as electric bells and circuit breakers. Magnetic fields and field lines are explained, including how they are produced by currents and plotted using compasses.
Magnetism by wasay zia
Oersted showed that magnetic effects can be produced by moving electrical charges; Faraday and Henry showed that electric currents can be produced by moving magnets. The document discusses the history and science of magnetism, including how magnets have north and south poles, magnetic fields, and how different materials interact with magnetic fields through mechanisms like ferromagnetism, diamagnetism, and paramagnetism.
Magnetism ppt
Magnetism is produced by magnets which have north and south poles and magnetic field lines. The earliest magnets were naturally occurring lodestone. Magnets attract opposite poles and repel like poles. The Earth itself acts like a giant bar magnet due to its nickel-iron core. Magnetic substances are composed of small magnetic domains that align when exposed to an external magnetic field. 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 electric current into rotational motion using electromagnetic induction. Generators also use electromagnetic induction to produce electric current from mechanical motion. Direct
Magnetism and Electromagnetism
The document discusses various topics related to magnetism including:
- The ancient discovery of magnetism in lodestone by the Chinese in 2000 BC who used it for navigation.
- The properties of magnets including having magnetic fields with poles that attract or repel other magnets and magnetic materials.
- Induced magnetism caused by an external magnetic influence.
- Differences between magnetic, non-magnetic, and magnetized materials and how to test for magnetism.
- Electrical and physical methods of magnetization and demagnetization.
- Plotting magnetic field lines using a compass to map field patterns.
Magnets in orthodontics.1
This document discusses the use of magnets in orthodontics. It begins by providing background on magnets, including their properties, types of magnetic materials, and how magnets are used in daily life and medicine. The document then discusses various magnetic appliances that can be used in orthodontics, including magnetic activators, twin blocks, and rare earth magnets. It covers the advantages of magnets in orthodontics, such as reduced patient cooperation and discomfort. The document also discusses some disadvantages, such as corrosion of magnets and concerns about biological effects of magnetic fields. In summary, the document provides an overview of magnets and their various applications and considerations for their use in orthodontic treatment.
Role of Magnets
Magnets are objects that produce magnetic fields and attract iron objects. There are different types of magnets including permanent magnets, temporary magnets, and electromagnets. Magnets have many important uses in technology, medicine, science, music, art, toys, jewelry, and transportation. They are crucial components of devices like speakers, computers, motors, and medical imaging machines. Magnets also have applications in areas like art, toys, scrap sorting, and magnetic levitation transportation. The student learned that magnets play a much more significant role in daily life than previously realized.
SIMPLE PHENOMENA OF MAGNETISM
This document discusses the basic properties and phenomena of magnetism. It describes how magnets have two poles (north and south) and magnetic field lines that run from the north to south pole. Magnetic materials like iron and steel can be magnetized when placed near a magnet, while non-magnetic materials like copper, aluminum, and plastic are not affected. Electromagnets produce temporary magnetic fields when electric current flows through a coil wrapped around an iron core, whereas permanent magnets retain their magnetism. The document also covers the Earth's magnetic field and how to identify magnetic field patterns using iron filings or a compass.
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Unit 7
- 1. Andrea Fernández Peñalver 6º De Primaria
- 2. MAGNETISM Magnets are use in our everday lives Fridge magnets Clohes tag magnets Metal detector Magnetisc resonances Credit cards
- 3. MAGNETIC FIELD A magnetic field is the space around a magnet in which the magnetic force acts,whit some metal(airon and nickel) If we spead iron filings around a magnet,they will aling showing the magnetic field
- 4. MAGNETIC POLES REPEL ATTRACT If the two poles are the same,the magnets repel each other If the two poles are different,the magnets attract each other
- 5. TERRESTIAL MAGNETISM The Earth behaves like a big magnet.The inner core is composed of a mass of iron and nikel at very high temperatures,which rotates
- 6. ELECTRICITY AND MAGNETISM 1. When the electric current flows through,each turn in the coil adds to the magnetic field,the force of electrical attraction. 2. If we place an iron rod inside the coil or bobbin,this furter increases the attraction and it bocomes an electromagnet.
- 7. HOW MAGNETISM PRODUCES ELECTRICITY If you conected a coil of copper wire to a meter that measured electricity. I pushed a magnet into the centere of a coil and obseved that the needle of the meter moved.