Question

What is an electromagnet ? Name two factors on which the strength of magnetic field of an electro-magnet depends and state how does it depend on the factors stated by you.

Answer 1

An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet.

The strength of magnetic field of an electromagnet depends on:

1. Number of turns: The strength of magnetic increases on increasing the number of turns of the winding.
2. Current: The strength of magnetic field increases on increasing the current through the solenoid.