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J & K CET Engineering J and K - CET Engineering Solved Paper-2015

  • question_answer
    Consider a region of uniform magnetic field directed along positive X-axis. Now a positive test charge Q, located at origin O \[(0,0)\] inside the field, is released from rest position. The particle will

    A)  Remain stationary at origin O

    B)  Move along positive X-axis

    C)  Move along negative X-axis

    D)  Undergo a circular motion in the X-Y plane

    Correct Answer: A

    Solution :

    The particle is released from rest, i.e. \[v=0\]. Force on the particle due to magnetic field \[F=qvB=q(0)B=0\] Therefore, particle remains stationary at the origin.


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