A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is: 

(i) Pushed into the coil, 

(ii) Withdrawn from inside the coil, 

(iii) Held stationary inside the coil?

When a coil of insulated copper wire is connected to a galvanometer, following observations will take place for each option:

(i) If a bar magnet is pushed into the coil, an induced current is set-up in the coil due to change of magnetic field through it. As a result, galvanometer gives a deflection

(ii) If a bar magnet is withdrawn from inside, again an induced current is set up in the coil due to change of magnetic field through it. As a result galvanometer gives a deflection in the reverse direction.

(iii) If a bar magnet is held stationary inside the coil then then there is no induced current in the coil, because there is no change in magnetic field through it. As a result, galvanometer does not show any deflection.