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?
A
the magnet is moved towards the stationary solenoid
B
there is no relative motion
C
the magnet is moved away from the stationary solenoid
D
the solenoid is moved away from the stationary magnet
Verified Correct Answer: B.
Physical Principles & Numerical Solution
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.
Source: WAEC / JAMB / NECO Classroom Archive (Record #64915)