Question

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

• 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 1

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.