Check the listing for details. Student Eddy Current Demonstration Tube-13 Inches. Condition: Used. Listed at 30.00 USD. Eddy Currents: As the magnet falls through the tube, its changing magnetic field induces circulating electric currents (eddy currents) within the tube itself. These currents create their own magnetic field that opposes the falling magnet's motion, causing the magnet to fall at a significantly slower rate than a non-magnetic object.
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