Question

How does a magnet can be demagnetise
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Answer 1

Demagnetize a Magnet by Heating or Hammering. If you heat a magnet past the temperature called the Curie point, the energy will free the magnetic dipoles from their ordered orientation. ... You can get the same effect by repeatedly hammering a magnet, applying pressure, or dropping it on a hard surface.

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Answer 2

Hey mate here is your answer hope this answer will help you.

Only temporary or man made magnet can be demagnetized by leving without the contact of any magnet