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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Graphical Questions

  • question_answer
    In an RC circuit while charging, the graph of in i versus time is as shown by the dotted line in the diagram figure, where i is the current. When the value of the resistance is doubled, which of the solid curve best represents the variation of in i versus time                    [IIT-JEE (Screening) 2004]

    A)            P    

    B)            Q

    C)            R    

    D)            S

    Correct Answer: B

    Solution :

                       In case of RC circuit \[i=\frac{E}{R}{{e}^{-t/RC}}\] \ \[{{\log }_{e}}i=-\frac{t}{RC}+{{\log }_{e}}\frac{E}{R}\] When R is doubled, the slope of the curve increases. Further at t = 0, the current will be less for an increased value of resistance.


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