- #1
Feodalherren
- 605
- 6
Homework Statement
A bar magnet is held above the center of a wire loop lying in the horizontal plane, as shown in the figure below. The south end of the magnet is toward the loop. After the magnet is dropped, what is true of the current in the resistor as viewed from above? (Select all that apply.)
It is counterclockwise as the magnet falls toward the loop.
It is clockwise as the magnet falls toward the loop.
It is always clockwise.
It is clockwise after the magnet has moved through the loop and moves away from it.
It is first counterclockwise as the magnet approaches the loop and then clockwise after it has passed through the loop.
Homework Equations
Lenz's law and Faraday's Law
The Attempt at a Solution
This is my conceptual picture of what's going on.
As the magnet is falling in the field lines are going N to S as always. So Just at the moment when the bottom of the South pole of the magnets hits the area inside the circle the field lines are coming toward us (as viewed from the top). As the magnet falls through and the N side is facing us, the field lines are again, coming toward us.
In both cases the current will be induced in such a way that the magnetic flux through the surface is constant. So it seems to me that it should flow clockwise in both cases. This is, however, incorrect. Where am I going wrong?