A coil lies flat on a level tabletop in a region where the magnetic field vector points straight up.The magnetic field suddenly grows stronger.When viewed from above,what is the direction of the induced current in this coil as the field increases?
A)counterclockwise
B)clockwise
C)clockwise initially,then counterclockwise before stopping
D)There is no induced current in this coil.

Question

Quizplus · Accepted Answer

According to Faraday's law of electromagnetic induction, an increase in magnetic field strength induces a current that flows in a direction such that the magnetic field it produces opposes the original increase in field strength. The current will flow in a direction that creates its own magnetic field pointing in the opposite direction to the external field. Since the external field points straight up, the induced current will flow in a direction such that its own magnetic field points straight down. This can be achieved by a clockwise current flow when viewed from above, which is the correct answer.

A Coil Lies Flat on a Level Tabletop in a Region