If a proton is projected in a direction perpendicular to a uniform magnetic field with velocity $v$ and an electron is projected along the lines of force, what will happen to proton and electron

  • A

    The electron will travel along a circle with constant speed and the proton will move along a straight line

  • B

    Proton will move in a circle with constant speed and there will be no effect on the motion of electron

  • C

    There will not be any effect on the motion of electron and proton

  • D

    The electron and proton both will follow the path of a parabola

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