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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 25

  • question_answer
    A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at and completely emerges out at\[t=T\text{ }sec\]. The current in the ring varies as               

    A)

    B)  

    C)

    D)

    Correct Answer: B

    Solution :

    [b] When the ring is just entering the magnetic field, emf is induced and current flows in one direction. When the whole ring in inside the magnetic field so there is no change in flux \[\Rightarrow \] Current = 0. When the ring just goes out of the region of flux, current flow in opposite directions.


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