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A circuit consists of two cells, each of...

A circuit consists of two cells, each of e.m.f. E and internal resistances `r_(1)` and `r_(2)` are connected in series through an external resistance X. If the potential difference between the ends of the first cell is zero, the value of X in terms of `r_(1)` and `r_(2)` will be

A

`r_(1)+r_(2)`

B

`r_(1)-r_(2)`

C

`r_(1)r_(2)`

D

zero

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