The Lorentz force on a charge in a magnetic field is described by the equation
F = q v X B
where F, v, and B are vectors (have direction) and the "X" described in the class content this week tells us what direction F is if we know the directions of v and B. When v and B are perpendicular, the magnitude of the force is qvB and it its direction is perpendicular to both v and B.
Is there a direction of the charge's motion, the velocity v, that would result in no force at all?