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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Application of EMI (Motor, Dynamo, Transformer)

  • question_answer
    The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following condition is correct                                    [MP PET 1993]

    A)            Lines of force minimum but induced e.m.f. is zero

    B)            Lines of force maximum but induced e.m.f. is zero

    C)            Lines of force maximum but induced e.m.f. is not zero

    D)            Lines of force maximum but induced e.m.f. is also maximum

    Correct Answer: B

    Solution :

               \[e\propto \frac{d\varphi }{dt};\] if f ® maximum then e ® minimum.


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