Methods of demagnetization

Demagnetization

Demagnetization is the process through which magnets lose their magnetism

Demagnetization result in scattering molecular magnets to face in randomly.

Methods of demagnetization

(i) By Heating:

Heating a magnetized material makes it loses its magnetism.

This is because the temperature rise causes the vibrations of molecular magnets to become so great that their ordinary arrangement is destroyed.

 (ii) By hammering:

Hammering a magnetized material placed in east-west direction, makes it loses most of its magnetism.

This is because when a magnet is hammered, the vibrations of the molecular magnets increase which result in random arrangement.

  (iii) By electrical method using alternating current

Here an alternating current is supplied to the solenoid in which the magnet is placed in east-west direction.

 The alternating current (a.c.) causes the molecular magnets to change from orderly to random arrangement as current changes direction of flow every half cycle.

The demagnetized magnet should be removed from solenoid and stored along east- west direction to avoid magnetization due to earth’s field.

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