Which of the following statements is NOT true about an electromagnet?

An insulated wire is wound around it.

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It works only in the presence of electricity.

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It is used in fans and radios.

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It is a permanent magnet.

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Solution

The correct option is D It is a permanent magnet.
An electromagnet is made by winding an insulated wire around a magnetic material. An electromagnet behaves like a standard magnet but only with an electrical influence. When the power generation to an electromagnet stops, the production of the magnetic field also stops. Thus an electromagnet is a temporary magnet and not a permanent magnet. It has many applications like fans, radio, motors, bells, etc.

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