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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 19

  • question_answer
    The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be

    A)

    B)

    C)

    D)

    Correct Answer: A

    Solution :

    \[e=-L\frac{di}{dt}\] During 0 to \[\frac{T}{4},\frac{di}{dt}=\] const. \[\therefore \,\,\,e=-ve\] During \[\frac{T}{4}\]to \[\frac{T}{2},\frac{di}{dt}=0\] \[\therefore \,\,e=0\] During \[\frac{T}{2}\] to \[\frac{3T}{4},\frac{di}{dt}=\]const. \[\therefore \,\,\,e=+ve\] Thus graph given in option represents the variation of induced emf with time.


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