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`

In an experiment on the measurement of internal resistance of as cell

1.	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`
Answer» Correct Answer - B `r=R(l_1/l_2-1)` `=R=(y/x=1)=((y-x)/x)R`

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