Two sources of equal emf are connected t...

Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are `R_1 and R_2(R_1gtR_1).` if the potential difference across the source having internal resistance `R_2` is zero, then

`(r_1 + r_2)/(r_2 - r_1)`

`r_2 - r_1 `

`(r_1r_2)/(r_2 - r_1)`

`(r_1 + r_2)/(r_1r_2)`

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