Explain briefly an experiment with a coil and magnet to demonstrate the phenomenon of electromagnetic induction.

Explanation

Figure consists of a cylindrical coil C made up of serveral turns of insulated copper wire connected in series to a sensitive galvanometer G. A strong bar magnet NS with its north pole pointing towards the coil is moved up and down. The following inferences were made by Faraday :
Whenever there is a relative motion between the coil and the magnet, the galvanometer shows deflection indicating the flow of induced current. The deflection is momentary. It lasts so long as there is relative motion between the coil and the magnet.
The direction of the flow of current changes if the magnet is moved towards and away from it. The deflection is more when the magnet is moved faster and less when the magnet is moved slowly. However, on reversing the magnet (i.e.,) south pole pointing towards the coil, same results are obtained, but current flows in the opposite direction.