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                BCIT Physics Department

Demonstration Manual

Electricity and Magnetism

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

Objective:

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

Apparatus:



Method:

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.

Note:

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.