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Question

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

A
The galvanometer shows a deflection when switch S is closed
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B
The galvanometer shows a deflection when switch S is open
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C
The galvanometer shows no change in deflection whether S is open or closed
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D
The galvanometer shows no deflection
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Solution

The correct option is C The galvanometer shows no change in deflection whether S is open or closed

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


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