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Two cells of same emf but different inte...

Two cells of same emf but different internal resistances `r_1 and r_2` are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is

A

`r_2-r_1`

B

`r_1-r_2`

C

`r_1`

D

`r_2`

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