Question

A coil of insulated copper wire is connected to a galvanometer. What would happen if a strong bar magnet is (a) pushed into the coil ? (b) withdrawn from inside the coil ? (c) held stationary inside the coil?​

Answer 1

(i) (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 change of magnetic field through it. As

a result, galvanometer gives a deflection (say towards left).

(b) When the bar

magnet is withdrawn from inside the coil, again an induced current is set­up in the

coil due to change of magnetic field through it. As a result galvanometer gives

a deflection in the reverse direction. (say towards right).

(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 magnetic field through it. As a result,

galvanometer does not show any deflection.

(ii) By changing current in another coil placed near it.

Answer 2

(a) The galvanometer gets deflected

(b) The galvanometer gets deflected to the opposite direction.

(c) No deflection in galvanometer.

Hope it helps.

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