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Magnet and magnetite

Which one of ...

Question

Which one of the following will not demagnetise a magnet?
(a) hammering it several times
(b) dropping it on the floor several times
(c) storing it along with keepers
(d) heating it to very high temperatures

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Solution

(c) storing it along with keepers
Keepers are small pieces of iron in which magnets are kept for safe storage. Hence, storing a magnet with keepers will not demagnetise it.

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