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In a metre bridge , the balancing length...

In a metre bridge , the balancing length from the left end is found to be 40cm, when a known resistance of `3Omega` is placed in the right gap, then the value of unknown resistance is `

A

`1Omega`

B

`2Omega`

C

`3Omega`

D

`4Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
Use concept of metre bridge
`X/R = (l)/(100-l)`
`X/3= (40)/(100-40)= 4/6`
`X=2Omega`
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