Double Stroking Method of Magnetization Quiz and Flashcards

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Questions and Answers

What are the two poles of a magnet?

North Pole, South Pole (correct)

Front Pole, Back Pole

East Pole, West Pole

Upper Pole, Lower Pole

According to the Law of Magnetism, how do unlike poles interact with each other?

Spin

Attract (correct)

Repel

Merge

What is the polarity of the end pointing towards the Earth's geographical North?

North Pole (correct)

East Pole

South Pole

West Pole

In which direction does a magnet come to rest during the Suspension method described?

North-South direction Signup and view all the answers

What happens if there is repulsion between the ends of two magnets brought near each other?

Their poles are like Signup and view all the answers

Which method involves using a known-pole magnet near an unknown-pole magnet to determine the polarity?

Attraction method Signup and view all the answers

What is the only sure way to test for the polarity of a magnet?

Repulsion Signup and view all the answers

What happens when a magnet is freely suspended?

It always come to rest in the North-South direction Signup and view all the answers

In which direction do unlike poles of magnets attract each other?

They attract each other Signup and view all the answers

What is the process of shielding a magnetic material from a magnetic field?

Surrounding the material with a material that diverts the magnetic field lines Signup and view all the answers

What do domains in the domain theory of magnetism consist of?

Tiny magnets called dipoles Signup and view all the answers

According to domain theory, what differentiates magnetic materials from non-magnetic materials?

Arrangement of atoms within the material Signup and view all the answers

What type of materials do magnets attract?

Certain materials like steel Signup and view all the answers

What does the term 'neutral point' refer to in the context of a magnetic field?

A point where magnetic forces are perfectly balanced Signup and view all the answers

What happens to iron fillings when a bar magnet is dipped into them, according to the text?

They cluster around the magnetic poles Signup and view all the answers

What are two properties commonly associated with magnets?

Ability to attract iron and low density Signup and view all the answers

According to the basic law of magnetism, what is a fundamental characteristic of magnetism?

Like poles attract and unlike poles repel Signup and view all the answers

How can you identify the polarities of an unmarked magnet?

By observing its behavior near another known magnet Signup and view all the answers

What happens to the ends of the steel bar when the magnets finish stroking?

They acquire opposite poles to that of the stroking pole. Signup and view all the answers

Why is lifting the permanent magnet high above the steel bar important?

To avoid cancellation of arrangement of dipoles already made. Signup and view all the answers

How are consequent poles of a magnet obtained?

By stroking a steel bar using two like poles of permanent magnets from the centre outwards. Signup and view all the answers

What happens when a magnet has consequent poles?

It never comes to rest if it is suspended. Signup and view all the answers

What is a solenoid?

A cylindrical coil of wires. Signup and view all the answers

How is the polarity of the magnet formed in a steel bar placed inside a solenoid determined?

By the direction of current. Signup and view all the answers

What is the effect of using alternating current on a magnet?

It demagnetizes the magnet by disorganizing the dipoles Signup and view all the answers

How can self-demagnetization be prevented in magnets?

By storing magnets in pairs with unlike poles adjacent to each other Signup and view all the answers

What happens to a magnet when it is hammered several times?

It loses its magnetism Signup and view all the answers

What occurs when a magnet is broken into two or more pieces?

Each piece becomes a complete magnet Signup and view all the answers

Why are magnets stored in pairs with their unlike poles adjacent to each other?

To prevent self-demagnetization due to repulsion Signup and view all the answers

Which method ensures that a magnet doesn't retain some magnetism due to the Earth's magnetic field during demagnetization?

Resting the magnet in East-West direction Signup and view all the answers

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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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.

Magnet Polarity Quiz

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