BCIT Physics Department

Demonstration Manual

Electricity and Magnetism

DEM44-1 - Eddy Currents Induced by a Linearly-Moving Magnet


- To show the effects of a moving magnetic field opposing Eddy Currents induced in a hollow copper pipe.



Observe that:

  1. The tube feels 'heavier' as the magnet passes down it.

  2. The magnet slows down, arriving at the end after a noticeably longer time than with the Brass cylinder.

The moving magnet has induced circulating currents whose own magnetic field opposes that of the magnet.


Before proceeding, demonstrate that the brass and copper are indeed non-magnetic.

youtube logo   Watch an Eddy Currents Induced by a Linearly-Moving Magnet video demonstration on Youtube

Note: in the video an aluminum pipe (which is also non-magnetic) is used instead of a copper pipe.

- Video Created at Utah State University by Professor Boyd F. Edwards and assistants.