Question

The length of a potentiometer wire is 10m. An accumulator of steady e.m.f. is connected across the wire. A Leclanche cell gives a null point at 750cm. If the length of the potentiometer wire is increased by 100cm, find the position of the balance point.

Answer 1

Given: l₁ = 10 m, E = E₁, 

 l₂ = 7.5 m, E = E₂ 

Case 2: l'₁ = 11 m, 

E = E₁ E = E₂ (Balance condition) 

To find: Position of balance point (l'₂)