Question

Demagnetization of magnets can be done by

• A. Rough handling
• B. All the above
• C. Magnetising in the opposite direction
• D. Heating

Answer 1

The correct option is B All the above

Explanation :
$\to$ Rough handling will disturb the alignment of magnetic dipoles (magnetic domains) such that the magnetization would become weak.

$\to$ When we heat the magnet the magnetic dipoles (magnetic domains) will get randomly aligned and the net magnetic moment will be destroyed.

$\to$ A magnet can be demagnetised by keeping the magnet in the magnetizing field applied in reverse direction as a result of which the magnetic moment of magnet will get neutralized.

Hence, option (D) is correct option.