I was attempting a homework question which went like this:
Where the crosses indicate a magnetic field in that rectangular region pointed into the screen, and we're asked which of the rings would fall first.
The increase in magnetic flux (as the loop enters the magnetic field) creates a counter-clockwise current in the loop, by Lenz's law. This motion in the magnetic field creates an upward magnetic force on the electrons near the bottom of the loop and a downward force on those at the top of the loop, but has no effect on the motion of the loop itself. The magnetic force on the loop itself will be in the horizontal direction.
However, the answer key tells me that the second loop will be slowed down by the magnetic field.
Is this true? Why?