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The given figure represents an arrangeme...

The given figure represents an arrangement of potentiometer for the calculation of internal resistance (`r`) of the unknown battery (`E`). The balance length is `70.0 cm` with the key opened and `60.0 cm` with the key closed. `R` is `132.40Omega`. The internal resistance (r) of the uknown cell will be

A

`22.1Omega`

B

`113.5Omega`

C

`154.5Omega`

D

`10Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`r=R(l_1/l_2-1)=132.4(70/60 - 1)=22.1Omega`
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