Question

Describe the method of demagnetising a magnet

Answer 1

The main idea of demagnetization is to cause the magnetic domain to point in random directions.
Methods:

Heating
Hammering
Electrical Method using a.c 

Heating

When heated with Bunsen burner, the atoms of the magnet will vibrate vigorously and cause the magnetic domains to lose their alignment. Letting the magnet cool in the East−West direction will ensure that the domains will not realign. 

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Answer 2

Apply AC Current To Demagnetize a Magnet. One way to make a magnet is by applying an electrical field (electromagnet), so it makes sense you can use alternating current to remove magnetism, too.The core of the material may retain a slight magnetic field due to hysteresis.


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