Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r1 and r2 (r1 > r2) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is
r1 + r2
r1 $-$ r2
${{{r_1} + {r_2}} \over 2}$
${{{r_1} - {r_2}} \over 2}$
Solution
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