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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
  • AThe galvanometer shows a deflection when switch $S$ is closed
  • BThe galvanometer shows a deflection when switch $S$ is open
  • CThe galvanometer shows no change in deflection whether $S$ is open or closed
  • D
    The galvanometer shows no deflection
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