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N cells, each of emf epsilon and interna...

N cells, each of emf `epsilon` and internal resistance r, are arranged in a ring in series. Two points including n cells on one side and N-n cells on the other side are connected to a resistor R. Calcualte the current through R (figure)

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NN GHOSH-FUNDAMENTAL OF CURRENT ELECTRICITY-Exercises
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  13. Calculate the current through the 5-V cell of the figure.

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