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

The magnetic field strength can be varied.

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It works as long as current is flowing through a solenoid.

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It is used in fans and radio.

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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 copper wire around a soft iron core and passing current through that wire. It behaves as a magnet as long as current is flowing through the wire. Hence an electromagnet is a temporary magnet. It is not a permanent magnet. The strength of an electromagnet can be varied by varying the current in the circuit. It is used in crane, t.v., electric bell, loudspeakers etc.

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(a) What is a solenoid ? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.

(b) Name the type of magnet with which the magnetic field pattern of a carrent-carrying solenoid resembles.

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