Question

When two resistances 𝑅1 and 𝑅2 connected in series and introduced into the left gap of a meter bridge and a resistance of 10Ω is introduced into the right gap, a null point is found at 60 cm from left side. When 𝑅1 and 𝑅2 are connected in parallel and introduced into the left gap, a resistance of 3Ω is introduced into the right-gap to get null point at 40 cm from left end. The product of 𝑅1𝑅2 is _______ Ω2.

Answer 1

The answer is 30.