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NEET Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर NEET PYQ-Current Electricity Charging Capacitors

  • question_answer
    The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of \[10\,\,\Omega \] is [NEET 2013]

    A)  \[0.2\,\,\Omega \]          

    B)       \[0.5\,\,\Omega \]

    C)  \[0.8\,\,\Omega \]          

    D)       \[1.0\,\,\Omega \]

    Correct Answer: B

    Solution :

    [b]
    As         \[l=\frac{E}{R+r}\]
    or         \[E=l(R+r)\]
                \[2.1=0.2(10+r)\]
                \[10+r=\frac{2.1}{2}\times 10\]
    \[\therefore \]      \[r=10.5-10=0.5\,\Omega \]


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