When the velocity vector (v) is parallel to the magnetic field vector (B), the cross product (v x B) is zero. Therefore, the magnetic force (F) on the charged particle is zero. With no force acting on it, the particle will continue to move in a straight line with constant velocity according to Newton's first law of motion.
If a charged particle (+q) is projected with certain velocity parallel to the magnetic field, then it will
Asked in UPSC NDA 1 2015 · Topic: Electric Current (Drift velocity and microscopic origin of current)
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