Which one of the following activity will not affect the strength of a magnet?

Heating

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Other magnets in close proximity to the magnet

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Radiation

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Painting

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Solution

The correct option is D
Painting

Painting will not affect the strength of a magnet if the thickness of paint is not very large. On the other hand, the phenomenon such as heating and hitting affect the strength of a magnet. Even bringing magnets in close proximity to the given magnet affects the strength.

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