A bar magnet is oriented vertically,and a flat coil with its plane oriented horizontally is located a short distance just below the bottom of this magnet.The instant after the magnet is dropped from rest,you observe that a counterclockwise current is induced in the coil,as viewed from below the coil.From this observation,you can conclude that the lower end of the magnet is a south pole.

Question

Quizplus · Accepted Answer

According to Lenz's law, the direction of the induced current will be such that it creates a magnetic field that opposes the change in the magnetic field that caused it. Since the magnet is dropping due to gravity and its magnetic field is decreasing as it moves away from the coil, the induced current will create a magnetic field that opposes this change by creating a magnetic field that points upward. By the right-hand rule, this means that the bottom of the magnet must be a south pole.

A Bar Magnet Is Oriented Vertically,and a Flat Coil with Its