The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance...

The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance G of the galvanometer....

a) The galvanometer shows a deflection when switch S is closed
b) The galvanometer shows a deflection when switch S is open
c) The galvanometer shows no change in deflection whether S is open or closed
d) The galvanometer shows no deflection

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