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Find the value of R in figure so that th...

Find the value of R in figure so that there is no current in the 50(Omega) resistor.

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This is a Wheatstone bridge with the galvanometer replaced by the 50(Omega) resistor. There will be no vurrent in the 50(Omega) resistor if the bridge is balanced.
In this case,
`(10(Omega))/(20(Omega))=R/(40(Omega))`
`R=20(Omega).`
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HC VERMA-ELECTRIC CURRENT IN CONDUCTORS-Exercises
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  14. A wire has a length of 2.0m and a resistance of 5.0(Omega).Find the el...

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  20. The internal resistance of an accumulator battery of emf 6V is 10(Omeg...

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