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

• A

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

• B

  The 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.