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J & K CET Engineering J and K - CET Engineering Solved Paper-2010

  • question_answer
    If a current of \[5\text{ }A\]in a coil of self inductance \[2\text{ }mH\]is cut-off in time \[0.1\text{ }s,\]the induced emf in the coil is

    A)  \[0.1\,\,V\]            

    B)  \[0.01\text{ }V\]

    C)  \[0.2V\]           

    D)  \[0.02V\]

    Correct Answer: A

    Solution :

    Induced emf \[e=L\frac{di}{dt}=2\times {{10}^{-3}}\times \frac{5}{0.1}\] \[=0.1\,\,V\]


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