5K20.20-Eddy currents in a paddle


Video: Watch this demo

Instructor’s video

Description: This demonstration shows how a conductor moving in a magnetic field will produce eddy currents, resulting in damped motion.


  • Large permanent magnet
  • Metal Paddle

Setup Procedure:

  1. Remove the protective plug from the magnet. Use caution.
  2. When the professor is done, insert the protective plug into the magnet. Use caution.

Demonstration Procedure:

  1. Move the paddle in between the magnet. Notice that the paddle movement is damped when near the magnet.

Strong magnetic field
This is a very powerful permanent magnet. Use caution.

Note: This demonstration is not visually effective. It requires the students to feel it for themselves.