5K20.25 Magnets in Eddy Tubes

Drop a magnet in clear tube. Then switch to aluminum tube. The magnet in metal tube falls slowly. Drop a lead weight down tube to show it is not just the tight fit.

Setup Requirements: Minimal. Use two small disk magnets. A short copper tube version with opening along side is available.

Equations: Eddy currents produced in tube produce magnetic field that opposes field of falling magnet. 

Safety Issues: Small magnets are brittle.