JAMB - Physics (2022 - No. 5)
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?
the magnet is moved towards the stationary solenoid
there is no relative motion
the magnet is moved away from the stationary solenoid
the solenoid is moved away from the stationary magnet
Explication
If both the coil and the magnet are stationary, then there is no change in the magnetic flux and hence no current is induced in the coil.