Magnetic force can act on an electron even when... neither of these.
Work Step by Step
This is discussed on page 460. The electron must be moving, and it must have some motion that is perpendicular to the magnetic field lines.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.