The figure shows a circuit diagram of a Wheatstone bridge to measure the resistance G of the galvanometer. The relation PQ=RG will be satisfied only when

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the galvanometer shows a deflection when switch S is closed

the galvanometer shows a deflection when switch S is open

the galvanometer shows no change in deflection whether S is open or closed

the galvanometer shows no deflection

answer is C.

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Detailed Solution

In balance condition, no current will flow through the branch containing S.

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