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

  • question_answer
    The current passing through a choke coil of 5 henry is decreasing at the rate of 2 ampere/sec. The e.m.f. developing across the coil is                                      [CPMT 1982; MP PMT 1990; AIIMS 1997; MP PET 1999]

    A)            10 V                                         

    B)            ? 10 V

    C)            2.5 V                                        

    D)            ? 2.5 V

    Correct Answer: A

    Solution :

               Given \[\frac{di}{dt}=2A/sec.,\ L=5\ H\]\[\therefore \ e=L\frac{di}{dt}=5\times 2=10\,V\]


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