A coil lies flat on a level tabletop in a region where the $\vec { B }$ field vector points straight up.The $\vec { B }$ field suddenly grows stronger in magnitude.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, a changing magnetic field induces an electromotive force (emf) that produces an electric current in a closed loop. The direction of the induced current is given by Lenz's law, which states that the induced current flows in such a way as to oppose the change in the magnetic field that produced it. In this case, as the magnetic field suddenly grows stronger, the induced current will flow in a way to produce a magnetic field that opposes the increase in the original field. That means, the induced current will generate a magnetic field that points downwards. By the right-hand rule, the induced current should flow in a clockwise direction to create a magnetic field pointing downwards. Therefore, the answer is B clockwise.

A Coil Lies Flat on a Level Tabletop in a Region