Permanent magnetism are demagnetized by:

Heating

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Hammering

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Dropping from a height

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Keeping in water

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Solution

The correct options are
A Heating
B Hammering
C Dropping from a height
A magnet can lose its properties if it is heated beyond a certain temperature, hammered or if it is dropped from a height. Mild heating causes a reduction in magnetic strength. The loss in magnetism is caused because the domains gain kinetic energy and start pointing in different directions. However, if a magnet is stored properly it will retain its magnetism longer.

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