Question 13:
A coil of insulated copper wire is connected to a galvanometer. What will happen
if a bar magnet is (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii)
held stationary inside the coil?
Answer:
A current induces in a solenoid if a bar magnet is moved relative to it. This is the
principle of electromagnetic induction.
(i) When a bar magnet is pushed into a coil of insulated copper wire, a current is
induced momentarily in the coil. As a result, the needle of the galvanometer
deflects momentarily in a particular direction.
(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper
wire,a current is again induced momentarily in the coil in the opposite direction. As
a result, the needle of the galvanometer deflects momentarily in the opposite
direction.
(iii) When a bar magnet is held stationary inside the coil, no current will be induced
in the coil. Hence, galvanometer will show no deflection.
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