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In an experiment on the measurement of i...

In an experiment on the measurement of internal resistance of as cell by using a potentionmeter, when the key `K` is kept open then balancing length is obtained at y metre. When the key `K` is closed and some resistance `R` is inserted in the resistance box, then the balancing length is found to be `x` metre. Then the internal resistance is

A

`((x-y))/y R`

B

`((y-x))/xR`

C

`((y-x))/yR`

D

`((x-y))/xR`

Text Solution

Verified by Experts

The correct Answer is:
B
`r=R(l_1/l_2-1)`
`=R=(y/x=1)=((y-x)/x)R`
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