A 10 m long potentiometer wire has a resistance of 20 Ω. If it is connected in series with a resistance of 55 Ω and a cell of emf 4 V and internal resistance 5 Ω, the potential gradient along the wire is
A. 0.1 V/m
B. 0.08 V/m
C. 0.01 V/m
D. none of these.
Answer:A
A 10 m long potentiometer wire has a resistance of 20 Ω. If it is connected in series with a resistance of 55 Ω and a cell of emf 4 V and internal resistance 5 Ω, the potential gradient along the wire is
A. 0.1 V/m B. 0.08 V/m C. 0.01 V/m D. none of these.