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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
    A cell of emf E and internal resistance r is connected across a resistance R. If internal resistance is equal to R, then the potential difference between the terminals of the cell must be:

    A) E                                 

    B) \[\frac{E}{2}\]

    C)             \[\frac{E}{4}\]                          

    D) \[\frac{3E}{2}\]

    Correct Answer: B

    Solution :

    (b) \[\frac{E}{2}\] We know that, \[V=\frac{ER}{R+r}\]                         \[=\frac{ER}{R+R}\]     \[[\because \,R=r]\]                         \[=\frac{ER}{2R}=\frac{E}{2}\]


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