1. A charged particle moves in a straight line through a certain region of space. The magnetic field in that region a) has a magnitude of zero b) has a zero component perpendicular to the particle's velocity c) has a zero component parallel to the particle's velocity 2. The north-pole end of a bar magnet is held near a stationary positively charged piece of plastic. Is the plastic a) attracted b) repelled c) unaffected by the magnet The answers are 1) either a or c, 2) c I don't understand why. Can someone explain.