Q.

A charged particle is moving in a region where a uniform gravitational field and uniform magnetic field exist (Electric field is zero). Then path of the particle may be

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a

a straight line

b

a parabola

c

a helic

d

both (1) and (3) are correct

answer is D.

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Detailed Solution

If the magnetic field is vertically down ward or vertically upward and the particle is projected vertically down ward or vertically upward. Then magnetic force F→=QV→×B→ is zero and the path is a vertical straight line. If the particle is projected vertically and the magnetic field is horizontal then the path is a helix of variable pitch.For parabolic path acceleration of the particle must be constant. But if both gravitational field g→ and magnetic field B→ exist and B→ is not parallel to g→ then acceleration of the particle cannot remain constant.
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