A coil made of insulated copper wire is connected to a galvanometer .
i] What happens to the deflection of the galvanometer if this coil is moved towards a stationary bar magnet and then
ii] Moved away from it ? Give reason for you answer and name the phenomenon involved.

Explanation

i] When the coil is moved towards the stationary bar magnet, the galvanometer shows a deflection in one direction. Since the motion of the coil towards the magnet changes the magnetic field around it, an induced an emf in the coil results in current flowing through it.
ii] When the coil is moved away from the magnet, the galvanometer shows a deflection in the opposite direction.
This is again because of the change in magnetic field around the coil, which induces an electric current in the opposite direction .
This phenomenon is called electromagnetic induction.