Question

Two potentiometers A and B having 4 wires and 10 wires, each having 100 cm in length are used to compare e.m.f. of 2 cells. Which one will give a larger balancing length? 

(a) Balancing length doesn't depend on the total length of the wire. 

(b) Both A and B will give same balancing length 

(c) Potentiometer B 

(d) Potentiometer A

Answer 1

Correct option: (c) Potentiometer B

Explanation:

Larger the length, lesser will be the potential gradient, so more balancing length will be required.