A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle will be
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Question

A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle will be

G1 Physics · Accepted Answer

Resolve the particle velocity into two components: v∥ = component parallel to B v⊥ = component perpendicular to B The parallel component remains unchanged because magnetic force has no component along B. The perpendicular component produces circular motion with radius r = mv⊥/(qB) Combining uniform motion along B with circular motion perpendicular to B gives a helix whose axis is along B. Hence option A follows.