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Question

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

  1. fraction numerator n E over denominator R plus n r end fraction    
  2. fraction numerator n E over denominator n R plus r end fraction    
  3. fraction numerator E over denominator R plus n r end fraction    
  4. fraction numerator n E over denominator R plus r end fraction    

The correct answer is: fraction numerator n E over denominator R plus n r end fraction


    Total e.m.f. = nE, Total resistance R + nr Þ i equals fraction numerator n E over denominator R plus n r end fraction

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