PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity
Problem
In a balanced Wheatstone bridge, no current flows through the galvanometer branch. Which one of the following best explains this observation?
(a) The emf of the battery divides equally between the two arms, so the potential difference across the galvanometer is zero.
(b) Equal and opposite currents reach the galvanometer junctions, therefore they cancel and no current flows through the galvanometer.
(c) The potentials at the two junctions connected to the galvanometer are equal.
(d) All four resistors are equal, so the bridge automatically prevents current through the galvanometer.