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J & K CET Medical J & K - CET Medical Solved Paper-2013

  • question_answer
    The induced emf in a coil of 10 H inductance in which current varies from 9 A to 4 A in 0.2 s is

    A)  200V             

    B)  250V

    C)  300V             

    D)  350V

    Correct Answer: B

    Solution :

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


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