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NEET AIPMT SOLVED PAPER SCREENING 2011

  • question_answer
    The current; 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 \[e=-L\frac{di}{di}\]                 During 0 to\[\frac{T}{4},\frac{di}{dt}=\text{constant}\]                 So,                          \[e=-ve\]                 For         \[\frac{T}{4}to\frac{T}{2},\frac{di}{dt}=0\]                                                 \[e=0\]                 For         \[\frac{T}{2}to\frac{3T}{4},\frac{dt}{dt}=\text{constant}\]                                                 \[e=+ve\]


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