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Two cells with the same emf E and differ...

Two cells with the same emf E and different internal resistances `r_(1)` and `r_(2)` are connected in series to an external resistances R . The value of R so that the potential difference across the first cell be zero is

A

`R=2(r_(1)+r_(2))`

B

`R=r_(2)-r_(1)`

C

`R=r_(1)-r_(2)`

D

`R=2(r_(1)-r_(2))`

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