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In a potentiometer experiment the balanc...

In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of `2Omega`, the balancing length becomes 120 cm.The internal resistance of the cell is

A

`2Omega`

B

`4Omega`

C

`0.5Omega`

D

`1Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
Here, `l_(1)=240cm,l_(2)=120cm,R=2Omega,r=?`
`r=((l_(1)-l_(2))/(l_(2)))R=((240-120)/(120))xx2=2Omega`
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