An unknown resistance X is to be determined using resistances `R_1, R_2 or R_3`.
Channel: Doubtnut
Date: 2020-07-12

An unknown resistance X is to be determined using resistances `R_1, R_2 or R_3`. Their corresponding null points are A, B and C. Find which of the above will give the most accurate reading and why?   `R= R_1 or R_2 or R_3`.