Question: Two cells, having the same e.m.f., are connected in series through an external resistance R. Cells have internal resistances r, and r, (r,>r,) respectively.

Two cells, having the same e.m.f., are connected in series through an

Two cells, having the same e.m.f., are connected in series through an external resistance R. Cells have internal resistances r, and r, (r,>r,) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is (a) + 2 1-12 2 (c) r + r (d) r r (b)

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