What is the function of a field magnet in an $AC$ generator?

What is meant by electromagnetic induction?

The electric current that always flows in the same direction is called alternating current.

Explain the phenomenon of electromagnetic induction. Describe an experiment to show that a current is set up in a closed loop when an external magnetic field passing through the loop increases or decreases.

What are the safety measures to be taken while dealing with household electricity?

On which principle does an electric motor work?