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What is the value of unknown resistance ...

What is the value of unknown resistance R, if galvonometer shows null delection in the given meter bridge 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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