Nikhilesh has a small piece of metal and a thread. He is curious to find whether the metal with him has magnetic properties. Which of the follwoing tools would you suggest?

An electric wire

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An electromagnetic cell

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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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