A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held above the center of the coil with its south pole downward. The magnet and the coil are now both raised
Upward with the same velocities. As viewed from above, what is the direction of the current
Induced in the coil as the magnet approaches the coil?
A) counterclockwise
B) clockwise
C) No current is induced in the coil.
D) An emf but no current is induced in the coil.

Question

Quizplus · Accepted Answer

No current is induced in the coil because both the magnet and the coil are moving together at the same velocity, maintaining a constant magnetic flux through the coil. According to Faraday's law of electromagnetic induction, a change in magnetic flux is required to induce an electromotive force (emf) and hence a current in the coil.

A Circular Coil of Copper Wire Is Lying Flat on a Horizontal