Two cells of the same emf E but different internal resistances r1 and r2 are connected in series to ….

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Two cells of the same emf E but different internal resistances r₁ and r₂ are connected in series to an external resistance R. The value of R, for which the potential difference across the first cell is zero, is given by

Options :-

1. R = r₁ - r₂
2. R = r₁ + r₂
3. R = r₁r₂
4. R = r₁/r₂

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