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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Graphical Questions

  • question_answer
    A horizontal loop abcd is moved across the pole pieces of a magnet as shown in fig. with a constant speed v. When the edge ab of the loop enters the pole pieces at time t = 0 sec. Which one of the following graphs represents correctly the induced emf in the coil         

    A)                                                                     

    B)                          

    C)                           

    D)

    Correct Answer: D

    Solution :

                       When loop enters in field between the pole pieces, flux linked with the coil first increases (constantly) so a constant emf induces, when coil entered completely within the field, no flux change so \[e=0.\]            When coil exit out, flux linked with the coil decreases, hence again emf induces, but in opposite direction.


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