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 potentail difference across the first cell is zero the value of R shown in the figure

`r_1 + r_2`

`r_1-r_2`

`(r_1+r_2)//2`

`(r_!-r_2)//2`

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