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CMC Medical CMC-Medical Ludhiana Solved Paper-2015

  • question_answer
    The changing flux through an area in terms of time is given by \[\phi =(2{{t}^{2}}+3t+4)\,Wb\] The emf induced at t = 5 s is

    A)  69 V                                     

    B)  20 V

    C)  23 V                                     

    D)  27 V

    Correct Answer: C

    Solution :

                    Given, changing flux is \[\phi =2{{t}^{2}}+3t+4\] On differentiating with respect to time \[|e|=\left| \frac{d\phi }{dt} \right|=\frac{d(2{{t}^{2}}+3t+4)}{dt}\]                    \[=4t+3+0\] At                           \[t=5\] \[e={{\left| \frac{d\phi }{dt} \right|}_{t\,=\,5s}}=4\times 5+3=23\,V\]


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