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The plot of the variation of potential difference across a combination of three identical cells in series, versus current is shown below. What is the emf and internal resistance of each cell?

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Potential difference, E = 6/3 = 2 V

Internal resistance, r = E/I = 6/1 = 6 ohm

Given, three cells are connected in series,

r' = r/3 = 6/3 = 2 ohm

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