Answer to Question #199340 in Physics for Faye

Question

A positively charged particle moves with velocity in a region where there is a magnetic field and a nonzero magnetic force on the particle. Consider how these three vectors are oriented with respect to one another. (a) Which pair of these vectors are always perpendicular? (b) Which pairs can have any angle between them? 

Answer 1

(a) Velocity vector is always perpendicular to the force vector

(b) Pair (velocity vector; magnetic field) and (force; magnetic field)