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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Self Evaluation Test - Current Electricity

  • question_answer
    A cell having an emf \[\varepsilon \]and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

    A)

    B)  

    C)

    D)

    Correct Answer: B

    Solution :

    [b] Current in the circuit, \[I=\frac{\varepsilon }{R+r}\] Potential difference across R, \[V=IR=\left( \frac{\varepsilon }{R+r} \right)R=\frac{\varepsilon }{1+\frac{r}{R}}\] When \[R=0,V=0\] \[R=\infty ,V=\varepsilon \]


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