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NEET Sample Paper NEET Sample Test Paper-24

  • 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: D

    Solution :

     We know induced emf \[e=-L\frac{di}{dt}\] During 0 to \[\frac{T}{4},\frac{di}{dt}=cons\tan t\] So, induced emf \[e=-ve\] For \[\frac{T}{4}\]to \[\frac{T}{2},\frac{di}{dt}=0\] Induced emf \[e=0\] For \[\frac{T}{2}\]to \[\frac{3T}{4},\frac{di}{dt}=cons\tan t\] So induced emf \[e=+ve\]


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