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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    The induced emf in a coil of \[10\text{ }H\]inductance in which current varies from \[9\text{ }A\]to \[4\text{ }A\]in \[0.2\,\,s\] is

    A)  \[200\,\,V\]             

    B)  \[250\,\,V\]

    C)  \[300\,\,V\]             

    D)  \[350\,\,V\]

    Correct Answer: B

    Solution :

    Included emf \[e=-L\frac{di}{dt}\] Given, \[L=10H,\,\,\Delta i=9-4=5A,\,\,dt=0.2s\] \[e=10\times \frac{5}{0.2}=250V\]


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