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

The figure shows a circuit diagram of a Wheatstone bridge to measure the resistance G of the galvanometer. The relation $\frac{P}{Q} = \frac{R}{G}$ will be satisfied only when

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

Solution:

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

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