Me. how can a permanent magnet be demagnetized?

a. cut the magnet in half.

b. heat the magnet up.

c. strike the magnet with a heavy blow.

both b and c

The correct answers are "Heat the magnet up" and "Strike the magnet with a heavy blow".

Explanation:

The domains of the permanent magnet of the magnet are aligned then the permanent magnet is magnetized. When it loses its magnetic field under some condition then it becomes Demagnetized. Demagnetization is to remove the magnetic properties from the magnet.

The permanent magnet can be demagnetized by the following ways:

By hammering or striking it.

By heating a magnet over a curie temperature.

By placing the magnet in the stronger opposite magnetic field.

Therefore, the correct option is both B and C.

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