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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.

A

20

B

30

C

40

D

50

Text Solution

Verified by Experts

The correct Answer is:
A
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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