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

Electromagnets are made using insulated wires.

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Electromagnets act as a magnet only when current passes through them.

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Electromagnets are used in fans and radio.

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Electromagnets are permanent magnets.

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Solution

The correct option is D
Electromagnets are permanent magnets.

An electromagnet is made by winding an insulated wire around a magnet. An electromagnet works as a standard magnet (generating magnetic fields) but only when current flows. Thus, an electromagnet is a temporary magnet and not a permanent magnet.

Electromagnets are used in motors and speakers, i.e they are present in fans and radio.

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Similar questions

Q. (a) How does an electromagnet differ forma permanent magnet?
(b) Name two devices in which electromagnets are used and two devices where permanent magnets are used.

Study the statements given below:
(i) Electromagnets can be made more powerful than ordinary bar magnets.
(ii) Soft iron is easy to magnetize and demagnetize.
(iii) The poles of an electromagnet are not affected by the direction of the current.
Which of the above statements about the electromagnets are correct?

Electromagnets are permanent magnets.

Q. Electromagnets are made by passing an electric current through a wire that has been wrapped around a soft iron core.

Q. Statement I: The poles of an electromagnet are not affected by changing the direction of the current in the coil.
Statement II: Electromagnets cannot be made more powerful than ordinary bar magnets.

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