Question

How does a magnet get demagnetized?

Answer 1

The process by which a magnet loses its magnetic properties is called demagnetization.

A magnet can be demagnetized by following methods,

Heating:

1. If a permanent magnet is heated, it loses its magnetic properties gradually.
2. When heated, the molecules of the magnet acquire more energy and hence vibrate faster.
3. This disturbs the alignment of the magnetic molecules and hence a magnet loses its magnetic properties.

Hammering:

1. The repeated hammering of a magnet disturbs the alignment of the magnetic molecules.
2. And hence it loses its magnetic properties.

Electrically:

1. A magnet can be demagnetized by placing it inside the coil which is connected to an alternating current source.
2. The continuous changing magnetic field created by the alternating current disturbs the molecules of the magnet hence it losses magnetic strength