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Two cells of emf E1 and E2 are joined in...

Two cells of emf `E_1 and E_2` are joined in opposition (such that `E_1>E_2`). If `r_1` and `r_2` be the internal resistances and R be the external resistance, then the terminal potential difference is:

A

`(E_1-E_2)/(r_1+r_2)xxR`

B

`(E_1+E_2)/(r_1+r_2)xxR`

C

`(E_1-E_2)/(r_1+r_2+R)xxR`

D

`(E_1+E_2)/(r_1+r_2+R)xxR`

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