How is an electromagnet made? Name two factors on which the strength of the magnetic field of an electromagnet depends.

You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch. (a) Draw a circuit diagram to represent the process. (b) Label the poles of the electromagnet.

Show with the aid of a diagram how a wire is wound on a U-shaped piece of soft iron in order to make it an electromagnet. Complete the circuit diagram and label the poles of the electromagnet.

Describe the construction and working of an electric bell with the help of a neat and labelled diagram.