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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
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The value of the unknown resistor $R$ is
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The correct answer is:
$220 \Omega$
$220 \Omega$
$$
\frac{55}{20}=\frac{R}{80} \Rightarrow R=\frac{55 \times 8}{2}=220 \Omega
$$
\frac{55}{20}=\frac{R}{80} \Rightarrow R=\frac{55 \times 8}{2}=220 \Omega
$$
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