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  5. Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर

12th Class Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank MCQ - Current Electricity

  • question_answer
    Five cells each of emf E and resistance r are connected in series. Due to oversight one cell is connected wrongly. The equivalent emf and internal resistance of the combination is:

    A) 5E                   

    B) 2E                       

    C) 3E                               

    D) 4E                        

    Correct Answer: C

    Solution :

    (c) 3E                                              Emf of the 5 identical cells of emf E are connected in series. Then the net emf of the combination should be 5E. But, one of them is wrongly connected i.e., with its polarity reversed. This cell will cancel the emf of another cell. Thus, equivalent number of cells in the combination =E+E+E+E-E=3E. Net emf of the combination = 3E.


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