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WB JEE Medical WB JEE Medical Solved Paper-2012

  • question_answer
    The magnetic flux linked with a coil satisfies the relation \[\text{o }\!\!|\!\!\text{ =}\,\text{4}{{\text{t}}^{2}}+6t+9\,Wb,\] where t is the time in second. The emf induced in the coil at \[t=2s\] is

    A)  22V             

    B)  18V

    C)  16V           

    D)  40V

    Correct Answer: A

    Solution :

     Given \[\text{o }\!\!|\!\!\text{ =4}{{\text{t}}^{2}}+6t+9\]and \[t=2s\] We know that \[\varepsilon =\frac{d\text{o }\!\!|\!\!\text{ }}{dt}\] Here, \[{{\frac{d\text{o }\!\!|\!\!\text{ }}{dt}}_{t\,=2}}=8\times 2+6\] \[\varepsilon =22\,V\]


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