Nikhilesh has a small piece of metal and a thread. He wants to find whether the metal is a magnet or not. What are the things he would need?

A piece of magnetic substance

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A magnet or a compass

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A piece of non-magnetic substance

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He does not require anything more

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Solution

The correct option is D He does not require anything more
When a magnet eg. bar magnet is suspended freely with a thread. Then it will always bends towards North pole i.e., it deflects towards North pole i.e, it deflects towards North pole. But a simple metal will not show any deflection. So, he will just take that metal piece and suspend it freely with a thread then it will not show any deflection this will give sure test that piece is not a magnet.
So, he does not required anything more.
Hence, option : D.

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