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What is the cause for the helical motion...

What is the cause for the helical motion of a charged particle in a magnetic field?

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The components of velocity, perpendicular to the magnetic field cause a circular motion of the charged particle and if there exists a component of velocity along the direction of the magnetic field, then the charged particle describes a helical path.
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SUBHASH PUBLICATION-MOVING CHARGES AND MAGNETISM-TWO MARKS QUESTIONS WITH ANSWERS
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