Given a piece of metal, ___ is necessary to test whether it is a magnet or not.

A magnet

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A compass

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A piece of iron

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no object

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Solution

The correct option is D
no object

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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