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12th Class Physics Electro Magnetic Induction Question Bank MCQ - Electromagnetic Induction

  • question_answer
    When the current changes from + 2 A to - 2 A in 0.05 s, an emf of 8V as induced in a coil. The coefficient of self-induction of the coil is:

    A) 0.2 H                           

    B) 0.4 H    

    C) 0.8 H                           

    D) 0.1 H

    Correct Answer: D

    Solution :

    (d) 0.1 H                                 Induced emf, \[e=-L,\frac{di}{dt}=-L\frac{(-2-2)}{0.05}\]             \[8=L\frac{(4)}{0.05}\Rightarrow L=\frac{8\times 0.05}{4}=0.1H\]


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