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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 
The Figure Shows A Circuit Diagram Of A ‘Wheatstone Bridge...
Options:
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
Answer: Option C
:
C
In balance condition, no current will flow through the branch containingS.

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