JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Graphical Questions

  • question_answer
    When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction

    A)            L is increased

    B)            L is decreased

    C)            R is increased                       

    D)            R is decreased

    Correct Answer: A

    Solution :

                       \[\frac{di}{dt}=\]slope of i ? t graph slope of graph (2) < slope of graph (1) so \[{{\left( \frac{di}{dt} \right)}_{2}}<{{\left( \frac{di}{dt} \right)}_{1}}\]                Also \[L\propto \frac{1}{(di/dt)}\Rightarrow {{L}_{2}}>{{L}_{1}}\]


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