Question

a coil of insulated copper is connected to a galvanometer. what happens when a bar magnet is: a) pushed into the coil b)withdrawn from inside the coil c) held stationary inside the coil give reasons for your observation

Answer 1

Answer:

(a) When a bar magnet is pushed into the coil of insulated copper wire connected to a galvanometer, an induced current is set-up in the coil due to the change of the magnetic field through it. As a result, the galvanometer gives a deflection (say towards the right).

(b)  When the bar magnet is withdrawn from inside the coil, again an induced current is set­up in the coil due to the change of magnetic field through it. As a result galvanometer gives a deflection in the reverse direction. (say towards left).

(c)  If the bar magnet is held stationary inside the coil, then there is no induced current in the coil, because there is no change in the magnetic field through it. As a result, the galvanometer does not show any deflection(zero deflection).   

                                       

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Answer 2

Answer: a.) Current will get induced in the coil

b.) Again, current will get induced in the coil

c.) Current wouldn't get induced

Explanation: In case of a.) And b.) I. E when the movement of magnet occurs, according to Faraday's law of induction ( I. E change in the magnetic field or the number of magnetic lines passing through the coil causes induction of current); there will be deflections in the galvanometer and current will get induced. But in case of c.), the magnet is stationary which means there is no change in magnetic field or the number of magnetic lines passing through it. Therefore there will be no current induced and no deflections will be seen in the galvanometer as well

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