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A potentiometer wire AB is 100 cm long a...

A potentiometer wire `AB` is `100 cm` long and has total resistance of `10Omega`. If the galvanometer shows zero deflection at the position `C`, then find value of unknown resistance

A

`4 Omega`

B

`6 Omega`

C

`8 Omega`

D

`2 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`(epsilon R)/(r + R)= K.l`
`(5R)/(1+R)=((10)/(10))(10)/(1)xx0.4`
`5R=4+4R`
`R = 4Omega`
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