Question

A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:

(a) the N-pole is removed?
(b) the S-pole is inserted?
(c) the magnet is a rest in the coil?
State three ways of increasing the deflection on the galvanometer.

Answer 1

(a) When the N-pole of a magnet is removed, deflection will take place in left direction because the induced current will flow in other direction.
(b) When the S-pole of a magnet is inserted, the deflection of galvanometer needle will take place in left direction.
(c) When the magnet is at rest in the coil, no deflection of galvanometer needle will take place.
It is because there is no relative motion between the coil and the magnet. Thus, the current induced is zero.