Two cells each of emf e but internal res...

Two cells each of emf e but internal resistance `r_1` and `r_2` are connected in series through an external resistance R. IF the potential difference across the first cell is szero while current flow, the relation of R in terms of `r_1` and `r_2`

` sqrt ( r_1r_2) `

` r_1+ r_2`

` r_1- r_2`

` (r_1+r_2)/( 2) `

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