(i) Key K is closed.(ii) Key K is opened.Give reason for each of your observations."
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# Two coils of insulated copper wire are wound over a non-conducting cylinder as shown. Coil 1 has comparative large number of turns. State your observations, when(i) Key K is closed.(ii) Key K is opened.Give reason for each of your observations."

(i) When key is closed, the galvanometer needle shows deflection for a very short time.

Reason: When key is closed, magnetic field lines around coil 2 increase momentarily. This causes an induced current to flow through it and therefore deflection occurs in one direction.

(ii) When key K is opened, the galvanometer needle again shows deflection for a very short time but in the opposite direction.

Reason: When key is opened, magnetic field lines around coil 2 decreases momentarily. This causes an induced current to flow in opposite direction. Therefore deflection occurs in opposite direction.

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Updated on: 10-Oct-2022

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