Question

A coil of insulated copper wire is connected to a galvanometer. What would happen if a bar magnet is
1) pushed into the coil ?
2)withdrawn from inside the coil ?
3)held stationary inside the coil ?

Answer 1

1)The magnetic field lines (flux) linked with the coil changes. As a result of this and induced current flows in the coil and the galvanometer shows a momentary deflection i.e the needle of the galvanometer moves momentarily in lone direction.
2) The magnetic field lines (flux) linked with the coil changes as a result of this and induced current flows in the coil but in a direction opposite to that in case.
3) what the magnet is held stationary in the coil ,there will be a magnetic fluxes in the coil but it will remain constant. since the magnetic fluxes dose not change,these is no induced current in the coil and the galvanometer shows no deflection.

Answer 2

$\huge\underline\mathfrak\pink{Answer}$

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(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper wire again the current is induced in the coil but this time it is in reverse direction.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