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Two cells of emf 2E and E with internal ...

Two cells of emf 2E and E with internal resistance `r_(1)` and `r_(2)` respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero is

A

`(r_(1))/(2)- r_(2)`

B

`r_(1)+r_(2)`

C

`(r_(1))/(2)+r_(2)`

D

`r_(1)-r_(2)`

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