At a particular instant,a proton moves toward the east in a uniform $\vec { B }$ field that is directed straight downward.The magnetic force exerted on it is

Question

Quizplus · Accepted Answer

According to the right-hand rule, if a positive charge (such as a proton) moves in the direction of the magnetic field, the magnetic force will be perpendicular to both the velocity of the charge and the magnetic field direction. In this case, the velocity of the proton points toward the east, and the magnetic field points toward the downward direction. Therefore, the magnetic force on the proton will be perpendicular to both of these directions, which is toward the north direction. So, the correct choice is C) toward the north.

At a Particular Instant,a Proton Moves Toward the East in a Uniform