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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
    When the resistance of 9 W is connected at the ends of a battery, its potential difference decreases from 40 volt to 30 volt. The internal resistance of the battery is    [DPMT 2003]

    A)            6 W

    B)            3 W

    C)            9 W

    D)            15 W

    Correct Answer: B

    Solution :

               The internal resistance of battery is given by                    \[r=\left( \frac{E}{V}-1 \right)R=\left( \frac{40}{30}-1 \right)\times 9\]\[=\frac{9\times 10}{30}=3\,\Omega \]


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