Which one of the following is not necessary to make an electromagnet?

Coil

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Dry cell

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Wires

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Permanent magnet

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Solution

The correct option is D Permanent magnet
An electromagnet is made by passing electric current through a coil. For this, an electric circuit with the coil as one of the components should be built. For making the circuit, wires and dry cell are required.
Permanent magnet is not required to make an electric circuit.

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