Which of the following ways will NOT cause a magnet to lose its magnetism?

Heating it strongly over a flame

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Dropping it on the floor repeatedly

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Coating it with a layer of oil

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Hitting it with a hammer repeatedly

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Solution

The correct option is C
Coating it with a layer of oil

On coating a magnet with a layer of oil, the magnet does not lose its magnetism. Most magnetic materials lose their magnetism if heated above a point known as the Curie temperature. Similarly, dropping a magnet on the floor repeatedly and hitting a magnet with a hammer repeatedly can lead to loss of magnetism.

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