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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
    A primary cell has an e.m.f. of 1.5 volts, when short-circuited it gives a current of 3 amperes. The internal resistance of the cell is                                                               [CPMT 1976, 83]

    A)                    4.5\[ohm\]

    B)                                      2\[ohm\]

    C)                    0.5\[ohm\]                    

    D)            1/4.5\[ohm\]

    Correct Answer: C

    Solution :

               Short circuit current \[{{i}_{SC}}=\frac{E}{r}\] Þ \[3=\frac{1.5}{r}\] Þ \[r=0.5\Omega \]


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