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A Wheatstone bridge has the resistances ...

A Wheatstone bridge has the resistances `10 Omega, 10 Omega, 10 Omega` and `30 Omega` in its four arms. What resistance joined in parallel to the `30 Omega` resistance will bring it to the balanced condition

A

`2 Omega`

B

`5 Omega`

C

`10 Omega`

D

`15 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
`10/10 = ((30R)/(30 + R))/10`
`rArr 10 = (30R)/(30 + R)`
`rArr R = 15 Omega`
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