question_answer

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                                         [DPMT 1979]

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