In an experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of $10\, ohm$ is connected in one gap, the value of resistance in other gap is ............. $\Omega$
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(a) Wheatstone bridge is balanced, therefore
$\frac{P}{Q} = \frac{R}{S}$ or $1 = \frac{{10}}{S}$ $ \Rightarrow $ $S = 10\,ohm$
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