First slide

combination of resistance

Question

In the circuit shown in the below figure, the potential difference between B and D is zero. The unknown resistance X is of

Moderate

A

$4 Ω$
B

$2 Ω$
C

$3 Ω$
D

E.m.f. of a cell is required to find the value of X

Solution

By balanced Wheatstone bridge condition, $\frac{16}{X} = \frac{4}{0 .5}$
$\Rightarrow X = \frac{8}{4} = 2 Ω$

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