Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor $R$ is ............. $\Omega$
AIEEE 2008, Easy
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According to the condition of balancing
$\frac{55}{20}=\frac{R}{80} \Rightarrow \mathrm{R}=220 \,\Omega$
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