Question

In post office box, the graph of galvanometer deflection versus resistance R (pulled out of resistance box) for the ratio 100 : 1 is given as shown (due to unsuitable values of R, galvanometer shows deflection). The two consecutive values of R are shown in the Figure:

The value of unknown resistance would be 

(1) 3.2 Ω 

(2) 3.24 Ω 

(3) 3.206 Ω 

(4) 3.2375 Ω

Answer 1

The Correct Option is (2) 3.24 Ω

Explanation:

For post office box (Wheatstone bridge), under balanced conditions