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Strong magnet falling in a copper tube

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Published on Feb 8, 2009

Falling piece of magnet/metal in tube of copper with/without slit(s)

Lenz Current Tubes (two types) dropping neodymium magnet down in 0.5 meter long, copper tube, causes a slow fall of the magnet. The moving magnetic field creates a strong opposing magnetic field, due to eddy currents in the cylindric conductor. The fall takes about 20 seconds in our set-up.
Cutting the tube in a special way (©GK), the fall is fast demonstrating that direction of eddy currents is perpendicular to the direction of the magnet movement. The fall takes only about 12 seconds.
Andrzej Karbowski, Copernicus University of Torun

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