Lenz's Law

Lenz's Law: a strong neodymium magnet falls slowly down a copper bus bar as though passing through a viscous liquid. Since magnetic fields pass through copper, magneview film reveals the location of the falling dipole magnet. The moving magnetic field from the falling magnet produce electric currents in the copper. These currents then produce magnetic fields that have the opposite polarity to the initial field. So a falling magnet makes the copper pipe briefly into an electromagnet that then repels the falling magnet. The rectangular copper “pipe” is from a water-cooled electromagnet power supply line, 1.5 x 2 in (4 x 5 cm) in cross-section, designed to supply a steady DC current of 5000 amps. This 40cm long piece weighs in at 6kg and has a 1.5cm diameter hole for cooling water to flow down its center. From a decommissioned particle accelerator magnet.

[ajinkyakale]

The magnet and the inner walls of the rod must be repelling each other, and the gravity does its job to pull the magnet down. What beautiful physics!