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

  • question_answer
    If the back e.m.f. induced in a coil, when current changes from 1A to zero in one millisecond, is 5 volts, the self-inductance of the coil is

    A) 5 H

    B) 1 H

    C) 5\[\times {{10}^{-3}}\operatorname{H}\]

    D) 5\[\times {{10}^{3}}\operatorname{H}\]

    Correct Answer: C

    Solution :

    Option [c] is correct.
    Explanation: =\[-L\frac{di}{dt}\]
    \[5=-L\times \frac{0-1}{{{10}^{-3}}}\]
    \[\operatorname{L}=5\times 1{{0}^{-3}}H\]


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