Two cells, having the same e.m.f., are connected in series through an external resistance R. Cell have internal resistances r 1 and r 2 ( r 1 > r 2 ) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:-

1. A. r 1-r 2
2. B. r 1+r 2 2
3. C. r 1-r 2 2
4. D. r 1+r 2

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