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

  • question_answer
    In a circular conducting coil, when current increases from 2 A to 18 A in 0.05 sec., the induced e.m.f. is 20 V. The self inductance of the coil is                                           [MP PET 2001]

    A)            62.5 mH                                  

    B)            6.25 mH

    C)            50 mH                                     

    D)            None of these

    Correct Answer: A

    Solution :

               \[|e|\,=L\frac{di}{dt}\Rightarrow 20=L\times \frac{(18-2)}{0.05}\Rightarrow L=62.5\ mH\]


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