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In potentiometer experiment, if l1 is th...

In potentiometer experiment, if `l_1` is the balancing length for emf of cell of internal resistance r and `l_2` is the balancing length for its terminal potential difference when shunted with resistance R then

A

`l_1=l_2((R+r)/R)`

B

`l_1=l_2(R/(R+r))`

C

`l_1=l_2(R/(R -r))`

D

`l_1=l_2((R-r)/R)`

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