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In a metre bridge experiment, unknown r...

In a metre bridge experiment, unknown resistance X and known resistance of `60Omega` is connected in left and right gap of a metre bridge respectively. If the null point is obtained at 40 cm from the left end then the unknown resistance is

A

`20Omega`

B

`40Omega`

C

`60Omega`

D

`80Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`X=(l_(x))/(l_(r))R=(40xx60)/(60)=40Omega`
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