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 $\frac{\mathrm{P}}{\mathrm{Q}}=\frac{\mathrm{R}}{\mathrm{G}}$  will be satisfied only when

1. A

the galvanometer shows a deflection when switch S is closed

2. B

the galvanometer shows a deflection when switch S is open

3. C

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

4. D

the galvanometer shows no deflection

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