Q.
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
Explanation
(c) In balance condition, no current will flow through the branch containing $S$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.