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Q.

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?

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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.

answer is B.

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Detailed Solution

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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