JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर JEE PYQ-Current Electricity Charging and Discharging of Capacitors

  • question_answer
    A resistance R and a capacitance C are connected in series to a battery of negligible internal resistance through a key. The key is closed at t = If after t sec the voltage across the capacitance was seven times the voltage across R, the value of t is [JEE ONLINE 12-05-2012]

    A) \[3RC\ell n2\]

    B) \[2RC\,\ell n2\]

    C) \[2RC\,\ell n7\]

    D) \[3RC\,\ell n7\]

    Correct Answer: A

    Solution :

    [a] \[t=3\,RC\ln 2\]


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