In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long…..

In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6Ω is connected to the other end of the wire. Determine the value of the unknown resistance.

A. 3.2Ω
B. 1.4Ω
C. 3.21Ω
D. 1.2Ω

Correct Answer: Option D

D. 1.2Ω

Explanation:

R/3.6=75/25=1/3

3R = 3.6

R = 1.2Ω