Internal resistance of battery of emf 2E...

Internal resistance of battery of emf 2E is `R_1` and battery of emf E is `R_2`. If the potential difference across the cell of emf 2E is zero, then value of R is

`(R_1 + R_2)/2`

`(R_1 - R_2)`

`(R_1 - R_2)/2`

`(R_1 - 2R_2)/2`

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