A positively charged particle moves in a region having a uniform ma...

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A positively charged particle moves in a region having a uniform magnetic field and uniform electric field in same direction. At some instant, the velocity of the particle is perpendicular to the field direction. The path of the particle will be
(A) a straight line
(B) a circle
(C) a helix with uniform pitch
(D) a helix with increasing pitch.
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