Video: Watch this demo
Description: This demonstration shows properties of Lenz’s Law via a magnet falling through a conductive tube
- metal tube
- cylindrical magnet
- non-magnetic cylinder
- Holding the metal tube with the bottom of the tube near the floor, drop the non-magnetic cylinder through the tube (note how long it takes to fall)
- Drop the cylindrical magnet through the tube, again note how much longer it takes to fall
Concepts: The moving magnet generates eddy currents in the surrounding conductive tube. These eddy currents interact with the magnet, resulting in a force that slows the magnet’s falling speed. The non magnet will fall down the tube quickly due to there being no present magnetic fields or forces.