asiake9420 asiake9420

27-02-2024
Biology

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Two cells of the same emf with different internal resistances r1 and r2 are connected in series with resistance r. What is the equivalent internal resistance of the combination?
1) r1 + r2 + r
2) r1 + r2 - r
3) r1 - r2 + r
4) r1 - r2 - r

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