In a region of space both electric and magnetic fields exist. A charge particle is fired in that field and it passes unaccelerated. Then

In a region of space both electric and magnetic fields exist. A charge particle is fired in that field and it passes unaccelerated. Then

  1. A

    E and B are parallel

  2. B

    E and B are mutually perpendicular

  3. C

    E and B are mutually perpendicular and velocity of projection  V must be perpendicular to both E and B and B = EV

  4. D

    If velocity of projection is  V then EB and  Vmust be mutually perpendicular and E = BV

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    Solution:

    Lorentz force F =QV×B + QE

    Since acceleration is zero,

    QV×B + QE=0E=B×V

    From the equation it is evident that EB and V are mutually perpendicular.

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