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Questions and Answers
What are the two poles of a magnet?
What are the two poles of a magnet?
According to the Law of Magnetism, how do unlike poles interact with each other?
According to the Law of Magnetism, how do unlike poles interact with each other?
What is the polarity of the end pointing towards the Earth's geographical North?
What is the polarity of the end pointing towards the Earth's geographical North?
In which direction does a magnet come to rest during the Suspension method described?
In which direction does a magnet come to rest during the Suspension method described?
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What happens if there is repulsion between the ends of two magnets brought near each other?
What happens if there is repulsion between the ends of two magnets brought near each other?
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Which method involves using a known-pole magnet near an unknown-pole magnet to determine the polarity?
Which method involves using a known-pole magnet near an unknown-pole magnet to determine the polarity?
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What is the only sure way to test for the polarity of a magnet?
What is the only sure way to test for the polarity of a magnet?
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What happens when a magnet is freely suspended?
What happens when a magnet is freely suspended?
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In which direction do unlike poles of magnets attract each other?
In which direction do unlike poles of magnets attract each other?
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What is the process of shielding a magnetic material from a magnetic field?
What is the process of shielding a magnetic material from a magnetic field?
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What do domains in the domain theory of magnetism consist of?
What do domains in the domain theory of magnetism consist of?
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According to domain theory, what differentiates magnetic materials from non-magnetic materials?
According to domain theory, what differentiates magnetic materials from non-magnetic materials?
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What type of materials do magnets attract?
What type of materials do magnets attract?
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What does the term 'neutral point' refer to in the context of a magnetic field?
What does the term 'neutral point' refer to in the context of a magnetic field?
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What happens to iron fillings when a bar magnet is dipped into them, according to the text?
What happens to iron fillings when a bar magnet is dipped into them, according to the text?
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What are two properties commonly associated with magnets?
What are two properties commonly associated with magnets?
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According to the basic law of magnetism, what is a fundamental characteristic of magnetism?
According to the basic law of magnetism, what is a fundamental characteristic of magnetism?
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How can you identify the polarities of an unmarked magnet?
How can you identify the polarities of an unmarked magnet?
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What happens to the ends of the steel bar when the magnets finish stroking?
What happens to the ends of the steel bar when the magnets finish stroking?
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Why is lifting the permanent magnet high above the steel bar important?
Why is lifting the permanent magnet high above the steel bar important?
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How are consequent poles of a magnet obtained?
How are consequent poles of a magnet obtained?
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What happens when a magnet has consequent poles?
What happens when a magnet has consequent poles?
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What is a solenoid?
What is a solenoid?
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How is the polarity of the magnet formed in a steel bar placed inside a solenoid determined?
How is the polarity of the magnet formed in a steel bar placed inside a solenoid determined?
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What is the effect of using alternating current on a magnet?
What is the effect of using alternating current on a magnet?
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How can self-demagnetization be prevented in magnets?
How can self-demagnetization be prevented in magnets?
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What happens to a magnet when it is hammered several times?
What happens to a magnet when it is hammered several times?
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What occurs when a magnet is broken into two or more pieces?
What occurs when a magnet is broken into two or more pieces?
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Why are magnets stored in pairs with their unlike poles adjacent to each other?
Why are magnets stored in pairs with their unlike poles adjacent to each other?
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Which method ensures that a magnet doesn't retain some magnetism due to the Earth's magnetic field during demagnetization?
Which method ensures that a magnet doesn't retain some magnetism due to the Earth's magnetic field during demagnetization?
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Study Notes
Magnetic Poles and Properties
- A magnet has two poles: North Pole (N) and South Pole (S)
- Like poles repel each other, while unlike poles attract each other
- Properties of a magnet include:
- Unlike poles attract, while like poles repel each other
- Attraction power is strongest at the poles
- A freely suspended magnet always comes to rest in the North-South direction
- Magnets attract certain materials, such as steel
Consequent Poles
- Consequent poles of a magnet are double like poles at the centre and ends of a magnetic material
- Consequent poles are obtained when a steel bar is stroked using two like poles of permanent magnets from the centre outwards
- A magnet with consequent poles never comes to rest if it is suspended
Electrical Method of Magnetization
- A solenoid is a cylindrical coil of wires
- A steel bar placed inside a solenoid connected to a direct current supply can be magnetized
- The polarity of the magnet formed depends on the direction of the current
Demagnetization
- Methods of demagnetization include:
- Hammering a magnet while it rests in the East-West direction
- Using an alternating current (AC) supply
- Dropping a magnet
- Demagnetization disorganizes the arrangement of dipoles in the magnet
Storing Magnets
- Magnets tend to become weaker with time due to self-demagnetization
- To prevent self-demagnetization, magnets are stored in pairs with their unlike poles adjacent to each other, with small pieces of soft iron called keepers placed across their ends
Domain Theory of Magnetism
- Magnetic materials are made up of tiny magnets called dipoles divided into regions called domains
- In a magnetized material, dipoles face in the same direction, while in an un-magnetized material, dipoles face in different directions
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Description
Test your knowledge on magnet polarity with this quiz. Learn about the properties of magnets and how unlike poles attract while like poles repel each other.
