n identical cells each of e.m.f. E and i...

n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The current through R is

`(nE)/(R + nr)`

`(nE)/(nR +r)`

`(E)/(R +nr)`

`(nE)/(R+r)`

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