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Questions  

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.

detailed solution

Correct option is B

Maximum force will act on proton and direction of force is perpendicular to the direction of motion . So it will move in a circular path. Force on electron will be zero because it is moving parallel to the field.

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