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Manipal Engineering Manipal Engineering Solved Paper-2011

  • question_answer
    A coil having an area of \[2{{m}^{2}}\] is placed in a magnetic field which changes from \[1\,Wb/{{m}^{2}}\] to \[4\,Wb/{{m}^{2}}\,\] in 2 s. The emf induced in the coil will be

    A)  4 V                                        

    B)  3 V

    C)  2 V                        

    D)         1 V

    Correct Answer: B

    Solution :

    Induced\[emf\,\,e=nA\frac{dB}{dt}\] \[A=\]area of coil\[=2{{m}^{2}}\] and        \[n=1\]                 \[e=\frac{1\times 2\times (4-1)}{2}=3V\]


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