Question

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

Answer 1

when a piece of soft iron place in the current carrying solenoid is called electromagnet

Answer 2

An electromagnet is that in which a magnetic material such as soft iron is placed inside the solenoid and on applying the current through solenoid,it is magnetized and after switching off the current ,it is demangentized.
here's your diagram...