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A uniform potentiometer wire AB of lengt...


A uniform potentiometer wire AB of length 100 cm has a resistance of `5Omega` and it is connected in series with an external resistance R and a cell of emf 6 V and negligible internal resistance. If a source of potential drop 2 V is balanced against a length of 60 cm of the potentiometer wire, the value of resistance R is

A

`1Omega`

B

`2Omega`

C

`4Omega`

D

`6Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
Current through the potentiometer wire is
`l=(6)/(R+5)`
`thereforeV=(6xx3)/((R+5))`
`2=(18)/(R+5)`
`R+5=9`
`R=4Omega`.
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