(b) When the magnet is held stationary and the coil is moved towards the south pole of the magnet, deflection in galvanometer is observed. The current flows in the coil only when there is a relative motion between the coil and the magnet due to which the galvanometer connected with the coil shows deflection. The direction of deflection in a galvanometer is reversed if the direction of motion (or polarity of the magnet) is reversed. This indicate that whenever there is a change in the magnetic flux linked with a coil, an emf is induced. The induced emf lasts so long as there is a change in the magnetic flux linked with the coil. The phenomenon in which an electric current is induced in a conductor because of a changing magnetic field is called electromagnetic induction.