To find out whether a metal piece is a magnet or not, what material(s) can one use from the following?

Thread

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Compass

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A piece of magnetic material

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A piece of non-magnetic material

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Solution

The correct option is C A piece of magnetic material
If the piece is a magnet, it will always come to align with geographical North-South direction of the Earth when freely suspended using a thread.
If the metal piece is brought near a compass, the compass will start showing deviations from its original alignment.
When the metal piece is brought near a magnetic material, it will attract the material.
Hence, option A,B and C are correct.

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