Which of the following ways will NOT cause a magnet to lose its magnetism?
A
Heating it
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B
Dropping it repeatedly
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C
Coating it with oil
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D
Hitting it
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Solution
The correct option is C
Coating it with oil
On coating a magnet with a layer of oil, the magnet does not lose its magnetism. Ferromagnetic materials lose their magnetism if heated above a point known as the Curie temperature. Similarly, on dropping it on the floor repeatedly and hitting a magnet with a hammer repeatedly, can lead to loss of magnetism.