Question

For the post office box arrangement to determine the value od unknown resistance, the unknown resistance should be connected between,
(a) `B` and `C`
(b) `C` and `D`
(c) `A` and `D`
(d) `B_(1)` and `C_(1)` .
.

Answer 1

Correct Answer - C
`BC, CD` and `BA` are known resistances.
The unknown resistance is connected between `A` and `D`.