A Wheatstone bridge is said to be completely balanced when:
A. All four resistors have exactly identical values.
B. Current through the galvanometer is maximum.
C. Potential difference across the galvanometer is zero.
D. The battery supplies zero current.
Answer: Option C
Solution (By JKSSB Mock Tests)
A Wheatstone bridge circuit consists of four arms with resistances P, Q, R, S and a galvanometer in the middle. It is balanced when no current flows through the galvanometer arm. This happens exclusively when the potentials at the two ends of the galvanometer are equal, meaning the potential difference across it is exactly zero (P/Q = R/S).
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