Description:

Faraday’s law of induction was proposed by the Michael Faraday in the year 1831.

This law states that how the change in the magnetic field linked with the conductor induces the electromotive force in the conductor.

The conductor coil is connected to the galvanometer.
A bar magnet is going near the conductor coil.

As the magnetic field of the bar magnet starts interacting with the coil. The galvanometer starts showing deflection.

As the higher amount of magnetic field of the bar magnet is linked with the coil, the galvanometer which is connected to the conductor coil shows more and more deflection.

When the bar magnet stops movement the galvanometer switches back to no deflection which shows no current in the conductor coil.

Again after moving the magnet in the backward direction the galvanometer starts showing deflection in opposite direction.

As the bar magnet moves back from the galvanometer the magnetic field linked with the conductor coil starts decreasing, then the deflection magnitude in the galvanometer is also starts decreasing.

When the bar magnet moves far away from the conductor coil so that no magnetic field of the bar magnet is linked with the coil. The deflection needle in the galvanometer switches back to the no deflection, which shows no current in the coil.

Again repeat this process,

As the change in the magnetic field of the bar magnet link with the conductor coil, the emf induces in the coil.

And when the change in the magnetic field stops, the induced emf in the conductor coil became zero.

And when the bar magnet moves backward, then the change in the magnetic field link with the conductor coil produces emf in the conductor coil, but this time the direction of the induced emf in the coil in opposite direction.

When the bar magnet moves far away from the conductor coil so that, no magnetic field of the bar magnet is linked with the coil, the deflection needle in the galvanometer switches back to the no deflection, because of no induced emf in the conductor coil.

After this experiment Micheal Faraday come to the conclusion that,

The emf induced in the coil is directly proportional to the change in the magnetic field link with the conductor coil.