Electromagnetic induction is the process of generating electric current with a magnetic field. It occurs whenever a magnetic field and an electric conductor, such as a coil of wire, move relative to one another. As long as the conductor is part of a closed circuit, current will flow through it.

The current produced by electromagnetic induction is greater when the magnet or coil moves faster, the coil has more turns, or the magnet is stronger.

As we can see in above figure.

(A) When there is no current I flowing in the coil, the galvanometer does not show any deflection.

(B) When we take the north pole of a bar magnet near the coil, the galvanometer shows deflection,which means current start flowing in the coil.

(C) When we hold the magnet at a place, there is no current in coil, which shows the concept of electromagnetic induction.

That is, the change in magnetic flux related to a coil produces the electric current in the coil.

(D) When we take away the magnet from coil, the direction of electric current in the coil also reverses.

Electric generators and electric transformers use electromagnetic induction to generate electricity or change the voltage of electric current