Two cells, having the same emf, are conn...

Two cells, having the same emf, are connected in series through an external resistance `R`. Cells have internal resistance `r_(1)` and `r_(2) (r_(1) gt r_(2))` respectively. When the circuit is closed, the potential difference across the first cell is zero the value of `R` is

`(r_1+r_2)/2`

`(r_1-r_2)/2`

`r_1+r_2`

`r_1-r_2`

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