In the circuit shown in the adjoining figure, the current between $B$ and $D$ is zero, the unknown resistance is of ................ $\Omega$
Medium
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(b) By balanced Wheatstone bridge condition $\frac{{16}}{X} = \frac{4}{{0.5}}$
$ \Rightarrow $ $X = \frac{8}{4} = 2\,\Omega $
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