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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Static EMI

  • question_answer
    When the current in a coil changes from 8 ampere to 2 ampere in \[3\times {{10}^{-2}}\]second, the e.m.f. induced in the coil is \[2\ volt\]. The self-inductance of the coil (in millihenry) is        [MNR 1991; UP SEAT 2000; Pb PET 2004]

    A)             1   

    B)            5

    C)             20 

    D)            10

    Correct Answer: D

    Solution :

               \[e=-L\frac{di}{dt}\Rightarrow 2=-L\left( \frac{8-2}{3\times {{10}^{-2}}} \right)\]\[\Rightarrow L=0.01\ H=10\ mH\]


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