A long,straight,horizontal wire carries current toward the east.A proton moves toward the east alongside and just south of the wire.What is the direction of the magnetic force exerted on the proton?

Question

Quizplus · Accepted Answer

Using the right-hand rule, the magnetic field around the wire is directed downward below the wire. Since the proton is moving east (the same direction as the current), the magnetic force on it, given by the cross product of velocity and magnetic field, is directed toward the north.

A Long,straight,horizontal Wire Carries Current Toward the East