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  4. In the figure there is no deflection in the galvanometer. Then R is equal to

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Q. In the figure there is no deflection in the galvanometer. Then $R$ is equal toPhysics Question Image

Current Electricity

Solution:

No current in the galvanometer means, wheatstone bridge is balanced.
$\frac{2 \Omega}{10 \Omega}=\frac{R}{30}$ or $R=6 \Omega$.