Lenz' Law Demo

Equipment: 3/4", 5 foot copper pipe, Neodymium Magnets (any copper pipe will work, the thicker the edges the better)
Procedure: Prepare students for weird physics. Drop neodymium magnets down pipe.
Explanation: Falling magnet generates opposite currents in the tube above and below the magnet. Currents obey Lenz's law and induce a magnetic field which opposes motion.
contributed by Mark Hossler; mhossler@landmark-cs.org

Magnetic Induction Tube

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Magnetic Index Card

Tape a paper clip behind it!
contributed by N. Milburn

Gauss Rail Gun DIY project: