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(C) In a Wheatstone bridge,the bridge is said to be balanced when the potential difference across the galvanometer is zero. When the bridge is balance

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

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(C) In a Wheatstone bridge,the bridge is said to be balanced when the potential difference across the galvanometer is zero. When the bridge is balanced,no current flows through the galvanometer branch. In the given circuit,the switch $S$ is in series with the galvanometer. If the bridge is balanced,the potential at the two ends of the galvanometer branch is the same. Therefore,even if the switch $S$ is closed,no current will flow through the galvanometer,and it will show no deflection. Thus,the deflection remains zero regardless of whether the switch $S$ is open or closed,provided the condition $\frac{P}{Q} = \frac{R}{G}$ is met.

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

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