A Wheatstone bridge has the following arm resistances: (AB), (BC), (AD) and (DC)
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
A Wheatstone bridge has the following arm resistances: R1=120Ω (AB), R2=100Ω (BC), R3=200Ω (AD) and R4=210Ω (DC). A galvanometer of resistance 30Ω is connected between B and D and a 12V battery (having negligible internal resistance) is connected between A and C.
(i) Determine the potential difference between the junctions B and D.
(ii) Calculate the magnitude of current through the galvanometer.
(iii) State clearly the junction (B or D) that is at the higher potential.