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[" 15."n" identical cells each of e.m.f....

[" 15."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 "],[[" (a) "(nE)/(R+nr)," (b) "(nE)/(nR+r)],[" (c) "(E)/(R+nr)," (d) "(nE)/(R+r)]]

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