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In a potentimeter experiment , it is fo...

In a potentimeter experiment , it is found that no current passes through the galvanometer when the termials of the cell are connected across 52 cm of the potentimeter wire . If the cell is shunted by a resistance of `5Omega` , a balance is found when the cell is connected across 40 cm of the wire . Find the internal resistance of ht cell .

A

`2Omega`

B

`2.5Omega`

C

`1Omega`

D

`1.5Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
When a potentimeter is used for the determination of the inernal resistance of cell ,
`r=(l_(1)/(l_(2))-1)R`
[ r is the internal resistance of the cell R is the known resistance `l_(1) and l_(2)` are the positions of the null point in the two cases ]
`thereforer=((52)/(40)-1)xx5=1.5Omega`
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