A coil lies flat on a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

Question

Quizplus · Accepted Answer

According to Lenz's Law, the induced current will flow in a direction that opposes the change in magnetic flux. Since the magnetic field is pointing up and vanishes, the induced current will create its own magnetic field pointing up to oppose the decrease. When viewed from above, this results in a counterclockwise current.

A Coil Lies Flat on a Table Top in a Region