KVPY Sample Paper KVPY Stream-SX Model Paper-25

  • question_answer
    In the graph variation of magnetic field with time 't' applied perpendicular to the plane of the ring is shown:

    A) at \[t=2\sec \]and current flowing in ring is equal to zero

    B) current will change its direction two times in time intervals \[t=0\] to \[t=8\,\,\sec \]

    C) current will change its direction only once in the above interval

    D)  flux in ring is same at \[t=0\] & \[t=4\,\,\sec .\]

    Correct Answer: C

    Solution :

    For \[t=0\] to \[t=4:\frac{dB}{dt}\] is negative, and for \[t=4\] to \[t=8:\frac{dB}{dt}\]is positive.
    \[\therefore \]      sign of current will change only once.

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