What is an electromagnet?

What is an electromagnet? Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.

The magnetic field produced due to current flowing in a coil or a solenoid can be used to magnetise a material like soft iron temporarily. The insulated copper wire is wrapped on a soft iron piece. When current is passed through the coil using a battery and a key the iron piece behaves like a bar magnet as long as current is being passed. Such a magnet is called an electromagnet.

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