A coil lies flat on a horizontal tabletop in a region where the magnetic field points straight down.The magnetic field disappears suddenly.When viewed from above,what is the direction of the induced current in this coil as the field disappears?
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 induction, as the magnetic field disappears, an induced current will flow in the direction that opposes the change in the magnetic field. In this case, since the magnetic field is directed downwards, the induced current will create a magnetic field that opposes the downward field. Using the right-hand rule for current, we can see that a clockwise current will create an upward magnetic field, which opposes the downward field. Therefore, the induced current will be clockwise.

A Coil Lies Flat on a Horizontal Tabletop in a Region