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Is it true that electromagnets are used in cranes, electric motors, telephones, loudspeakers, electric bell etc?

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a

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answer is A.

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Detailed Solution

The above statement is true.
Electromagnets are used in cranes, electric motors, telephones, loudspeakers, electric bell etc.
An electromagnet is a magnet whose magnetic property is produced by passing the flow of electric current through the wire wound around a soft iron bar. It's only a temporary magnet.
Because it only works as a magnet when an electric current is passed through it. When the flow of electric current is disrupted, it stops working as a magnet.
Electromagnets can be strengthened by increasing the current flowing through the circuit and the number of turns in the coil.

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