A potential gradient of 6 × 10-3 V/ mm is set up on a potentiometer wire which has a resistance of 2 Ω/m. Two emfs 2.5 V and 1.3 V, once assisting and then opposing each other, are balanced on the wire. The balancing lengths in the two cases are in the ratio
A. 19 : 2
B. 19 : 6
C. 25 : 13
D. 2:1.
Answer:B
A potential gradient of 6 × 10-3 V/ mm is set up on a potentiometer wire which has a resistance of 2 Ω/m. Two emfs 2.5 V and 1.3 V, once assisting and then opposing each other, are balanced on the wire. The balancing lengths in the two cases are in the ratio
A. 19 : 2 B. 19 : 6 C. 25 : 13 D. 2:1.