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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Kirchhoff's Law, Cells

  • question_answer
    The electromotive force of a primary cell is 2 volts. When it is short-circuited it gives a current of 4 amperes. Its internal resistance in ohms is                                                 [MP PET 1995]

    A)                    0.5

    B)                                      5.0

    C)                    2.0                                    

    D)            8.0

    Correct Answer: A

    Solution :

               \[E=V+ir\] After short-circuiting, \[V=0;\] Þ\[r=\frac{E}{i}=\frac{2}{4}=0.5\Omega \]


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