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Q.

A particle moves in a region having a uniform magnetic field and a parallel, uniform electric field. At some instant, the velocity of the particle is perpendicular to the field direction. The path of the particle will be

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a

a helix with non uniform pitch

b

a straight line

c

a circle

d

a helix with uniform pitch

answer is D.

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Detailed Solution

V is perpendicular to these both fields.

      By the electric field the charged particle will accelerated and by the magnetic field it will  rotates in a circle

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