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In the given potentiometer circuit , int...

In the given potentiometer circuit , internal resistance r of the cell of emf E is to be determined. When key K is open , balance length `AN_1` is 62cm. When K is closed , balance length `AN_2` is 58cm. The value of internal resistance r is nearly

A

`0.7Omega`

B

`0.5Omega`

C

`1.5Omega`

D

`2.0Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`r=(l_1-l_2)/(l_2)R`
`L_1` = 62cm (when key is open )
`l_2 = 58cm` (when key is closed )
`r=(l_1-l_2)/(l_2) xxR=4/58xx10=0.69~~0.7Omega`
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