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Two cells, whose e.m.f.'s are same are c...

Two cells, whose e.m.f.'s are same are connected in series. Their internal resistance are `r_1` and `r_2` respectively and `r_1gtr_2`. When this combination is connected with an external resistance R then potential difference between the terminals of first cell becomes zero. The value of resistance R will be

A

`r_1+r_2(2)`

B

`(r_1-r_2)//(2)`

C

`(r_1+r_2)//2`

D

`r_1-r_2`

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