The direction of a charged particle’s velocity is slowly rotated from being parallel…
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism
Problem
The direction of a charged particle’s velocity is slowly rotated from being parallel to a uniform magnetic field to being antiparallel (from 0∘ through 180∘). Which statement best describes how the magnitude of the magnetic force on the particle changes during this rotation?
(a) It decreases from a maximum at 0∘ to zero at 90∘, then increases back to the same maximum at 180∘.
(b) It increases from zero, reaches a maximum at 90∘, then decreases symmetrically to zero at 180∘.
(c) It increases continuously from zero at 0∘ to a maximum at 180∘.
(d) It remains constant for all angles.