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A charged particle is moving in a region of uniform magnetic field and a parallel uniform electric field. At some time the velocity of the particle is perpendicular to the magnetic field. The trajectory of the particle will be

$\begin {array} {1 1} (a)\;Straight\: line & \quad (b)\;Circle \\ (c)\;Helix\: with\: uniform\: pitch & \quad (d)\;Helix\: with\: non-uniform\: pitch \end {array}$


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1 Answer

The speed along the axis of the helix is not constant due to the presence of electric field.
The perpendicular component is unaltered and hence the motion is helix with a non-uniform pitch
Ans : (d)
answered Feb 17, 2014 by thanvigandhi_1

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