Question

In a meter bridge, the null point is found at a distance of 40cm from A. If a resistance of 12Ω is connected in parallel with S, the null point occurs at 50.0cm from A. Determine the values of R and S.

Answer 1

In first case l₁ = 40cm

In second case when S and 12Ω are in parallel balancing length l₂ =50cm, so

Substituting this value in (ii), we get

R = 4Ω , S = 6Ω