## Note on Magnetic Induction and Demagnetization

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#### Magnetic Induction

Magnetic induction is the process by which substances like iron are magnetised by the magnetic field. The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetised. Most of this induced magnetism is lost when the cause of magnetism is taken away.

#### Activity 1

1. Place an iron nail on the table.
2. Place small pin near the iron nail.
3. Now, put a bar magnet above the iron nail and see what happens.

You can see the iron nail gets magnetise and attract the pin towards it.

#### Demagnetization

Demagnetization means decreasing magnetic property or losing it completely. In the following conditions, magnet loses its property.
1. Dropping regularly from the table or height.
2. Rubbing against diamagnetic substances.
3. Bringing similar poles closer by applying an external force.
4. Using the magnet for making other magnets.
5. By heating the magnet.
6. By passing the magnet in a copper coil of alternating current (AC) and pulling it against the direction of the current.

Ways to prevent magnet from demagnetization:

1. Do not heat magnet or keep it near the hot object.
2. Do not drop the magnet.
3. Do not hit or rub magnet.
4. Do not let magnet rust.
5. Do not keep similar poles of magnet closer to each other.

• Magnetic induction is the process by which substances like iron are magnetised by the magnetic field.
• Demagnetization means decreasing magnetic property or losing it completely.
• There are various ways to demagnetize a magnet. for instance, Dropping regularly from the table or height, Rubbing against diamagnetic substances etc.
• In the magnet, each and every small part of the magnet is directed in the north and the south directions.
.

### Very Short Questions

Magnetic induction is the process by which substances like iron are magnetized by magnetic field.

The process of decreasing magnetic property or losing it completely is called demagnetization.

The activities that make magnet lose its magnetic properties are:

1. Dropping regularly from the table or height.
2. Rubbing against diamagnetic substances.
3. Bringing similar poles closer by applying external force.
4. Using the magnet for making other magnets.
5. By heating the magnet.
6. By passing the magnet in a copper coil of alternating current (AC) and pulling it against the direction of current.

Some of the ways to prevent magnet from demagnetization are as follow:

1. Do not heat magnet or keep it near the hot object.
2. Do not drop the magnet.
3. Do not hit or rub magnet.
4. Do not let magnet rust.
5. Do not keep similar poles of magnet closer to each other.

Magnetic induction is the process by which substances like iron are magnetized by magnetic field. The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetized. Most of this induced magnetism is lost when the cause of magnetism it is taken away.

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• ### ______ is the process by which substances like iron are magnetized by magnetic field.

Electro-static induction

Electro-magnetic induction

Magnetic induction

Electric induction

• ### ______ means decreasing magnetic property or losing it completely.

Demagnetization

Paramagnetization

Ferromagnetization

Magnetization

Iron nail

Rubber

Plastic

Wood

• ### When you hammer the magnet?

magnet gets rust

magnet gets magnetise

magnet gets demagnetise

magnet turns into iron

• ### When you drop the magnet from height?

magnet gets demagnetise

magnet gets ferro magnetise

magnet gets rust

magnet turns into iron

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