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In a potentiometer the balancing with a ...

In a potentiometer the balancing with a cell is at length of 220cm. On shunting the cell with a resistance of `3Omega` balance length becomes 130cm. What is the internal resistance of this cell.

A

`4.5Omega`

B

`7.8Omega`

C

`6.3Omega`

D

`2.08Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
`"Here", l_(1)=220cm, l_(2)=130cm, R=3Omega`
`r=((l_(1)-l_(2))/(l_(2)))R=((220-130)/(130))xx3=2.08Omega`
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