Question

a coil of insulated wire is connected to a galvanometer what should be seen if a bar magnet 1) pushed into a coil 2) withdrawn from inside the coil 3) held stationary inside the coil​

Answer 1

Answer:

here we apply the faradays law of EMF

condition 1 :- Magnet pushed inside coil = the galvanometer will show deflection as an induced emf set up in the coil will also set up a changing current in it.

condition 2:- withdrawn from inside the coil = the magnet when withdrawn from inside the coil will show deflection in opposite direction as the direction of changing current is reversed.

condition 3:- held stationary inside the coil = since the magnet is held stationary, there is no motional emf set up in the coil and hence the galavanometer will show no deflection.

Answer 2

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

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(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper wire again the current is induced in the coil but this time it is in reverse direction.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