Nikhilesh has a small piece of metal and a thread. He wants to find whether the metal is a magnet or not. Which of these things would he 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
If the piece is a magnet, it comes to rest in the north-south direction when suspended freely with a thread. This is because, the south pole of the magnet is attracted by earth's north pole and the north pole of the magnet is attracted by earth's south pole. So, he does not need anything more.

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