The drawing shows a bar magnet falling through a metal ring. In part a the ring is solid all the way around, but in part b it has been cut through. (a) Explain why the motion of the magnet in part a is retarded when the magnet is above the ring and below the ring as well. (b) Explain why the motion of the magnet is unaffected by the ring in part b.
Right hand rule
The Attempt at a Solution
I know that since the magnet is falling, the ring will feel a magnetic flux when the magnet is above and below the ring because the magnetic field is either increasing or decreasing. Since there is magnetic flux, an induced emf, and therefore an induced current flows through the ring whose direction is predicted by Lenz's Law and the right hand rule.
Knowing this, I can answer (b) because since the ring is cut, there is no current flowing through it so it doesn't affect the magnet's motion.
But my question is how does the induced current alter the motion of the magnet in part a? I can't seem to figure out how the induced current will cause the change in motion.
Thanks everyone who can help me out!