JEE MAIN - Physics (2008 - No. 15)
Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.
The value of the unknown resister $$R$$ is
$$13.75\Omega $$
$$220\Omega $$
$$110\Omega $$
$$55\Omega $$
Explanation
According to the condition of balancing
$${{55} \over {20}} = {R \over {80}} \Rightarrow R = 220\Omega $$
$${{55} \over {20}} = {R \over {80}} \Rightarrow R = 220\Omega $$
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