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What is the value of unknown resistance ...

What is the value of unknown resistance R, if galvonometer shows null deflection in the given meter bridge set up?

A

`97.50Omega`

B

`105Omega`

C

`150Omega`

D

`110Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
For null deflection in meter bridge
`(R_(1))/(R_(2))=(l)/((100-l)), therefore (65)/(R_(1))=(40)/(100-40)=(40)/(60)`
`R_(1)=65xx(60)/(40)=97.5Omega`
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