In the diagram given below, Coil – 1 is connected in series with a battery and a plug key while Coil – 2 is…
In the diagram given below, Coil – 1 is connected in series with a battery and a plug key while Coil – 2 is connected with a galvanometer.
(i) Why does the galvanometer show deflection only when the key (K) is plugged in and not when a steady current starts flowing in the circuit ?
(ii) What is observed in the galvanometer, when the key is plugged out ?
(iii) State the conclusion based on the observation of this activity.
Solution
(a)
(i) When the key is plugged-in, current starts in coil-1, the magnetic field around the coil is changed. This produces induced current in the coil-2 and galvanometer shows deflection
There is no change in magnetic field when a steady current starts flowing in the circuit.
(ii) Galvanometer shows deflection in the opposite direction.
(iii) Conclusion: Induced current is produced only when there is a change in magnetic field which occurs only when the key is plugged in or plugged out.
