r 2 ( r 1 > r 2 ) are ..." > r 2 ( r 1 > r 2 ) are connected in series. On connecting this ...">

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Two cells of equal emf and of internal resistances r1 and r2(r1>r2) are connected in series. On connecting this combination to an external resistance R, it is observed that the potential difference across the first cell becomes zero. The value of R will be

r1+r2
r1−r2
‌
r1+r2
2
‌
r1−r2
2

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