Question

If a proton is projection in a direction perpendicular to a uniform magentic 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

Answer 1

The correct option is B Proton will move in a circle with constant speed and there will be no effect on the motion of electron

Maximum force will act on proton so it will move on a circular path. Force on electron will be zero because it is moving parallel to the field.

So, option B is correct.