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

Options

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

Answer

B