Which of the below materials uses a permanent magnet?

Screw jack

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Glass tumbler

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Pin holder

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None of the above

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Solution

The correct option is C
Pin holder

A magnet is used in a pin holder. A small piece of magnet in the pin holder attracts the pins. As the pins are made of magnetic material, in the presence of a magnet, pins are attracted at the mouth of the pin holder.

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