Question

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:

(a) moving towards the solenoid
(b) moving into solenoid
(c) at rest inside the solenoid
(d) moving out of the solenoid

Answer 1

(d) moving out of the solenoid
Because the relative change in the value of magnetic field is maximum in this condition.