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 What will happen if a bar magnet is (i) pushed into the coil, (ii) withdrawn from inside the coil, (iii) held stationary inside the coil?
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 in the coil. As a result of which the needle of the galvanometer deflects direction of current.
(ii) When the bar magnet is withdrawn from inside the coil of the insulated copper wire, a current is again induced in the coil in the opposite direction. As a result, the needle of the galvanometer deflects in the opposite direction.
(iii) When a bar magnet is held stationary inside the coil, no current will be induced in the coil. So, no deflection in the galvanometer.
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