Question

A resistance wire connected in the left gap of a metre bridge balances a 10Ω resistance in the right gap at a point which divides the bridge wire in the ration 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1Ω of the resistance wire is:

(1) 1.5 x 10^-2 m

(2) 1.0 x 10^-2 m

(3) 1.0 x 10^-1 m

(4) 1.5 x 10^-1 m

Answer 1

Correct answer is (3) 1.0 x 10^-1 m

Length of 15 W resistance wire is 1.5 m

∴ length of 1 W resistance wire = \(\frac{1.5}{15}\) = 0.1

= 1.0 x 10^-1 m