In a meter bridge, the balancing length from the left end (standard resistance of $1 \,ohm$ is in the right gap) is found to be $20\, cm$. The value of the unknown resistance is ............... $\Omega$
AIPMT 1999, Easy
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$\frac{X}{1} = \frac{{20}}{{80}}$ $ \Rightarrow $ $X = \frac{1}{4}\,\Omega = 0.25\,\Omega $.
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