When the switch is closed in the circuit shown in the figure,the wire between the poles of the horseshoe magnet deflects upward.From this you can conclude that the left end of the magnet is

Question

Quizplus · Accepted Answer

The deflection of the wire indicates that a magnetic field is present and that there is a force acting on it. According to the right-hand rule for magnetic fields, the direction of the force on a positive charge in a magnetic field is perpendicular to both the magnetic field and the direction of the charge's motion. In this case, the wire carries a current from left to right, and the magnetic field of the horseshoe magnet is directed into the page on the left and out of the page on the right (as indicated by the dots and crosses). Therefore, the force on the wire must be upward, which means that the left end of the magnet must be a south pole.

When the Switch Is Closed in the Circuit Shown in the Figure,the