Question

a coil of Insulated copper wire is connected to galvanometer. what will happen if bar magnet is;(a) pushed into coil,(b) withdrawn from inside the coil and (c) held stationary inside the coil

Answer 1

If the N side of the bar magnet goes in:

a) The galvanometer will be deflected to the right.

b) The galvanometer will be deflected to the left.

c) There will be a magnetic flux (or magnetic field) in the coil but it will remain constant. Since the magnetic flux does not change, there is no induced current in the coil and the galvanometer shows no deflection.

Answer 2

$\huge{\mathcal{\purple {A}\green{N}\pink{S}\blue{W}\purple {E}\green{R}\pink{!}}}$

(i) when magnet is pushed near a bar magnet then it induces current due to electromagnetic induction.

(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper wire again the current is induced in the coil but this time it is in reverse direction.

(iii) When a bar magnet is held stationary inside the coil then no current is induced that’s why galvanometer will show no deflection.