Date: Thu, 7 Nov 2002 10:57:54 -0600

Author: Ed Dudak

Subject: Re: mod on eddy current


Sounds like something I'd like to use. Where did you get the
magnets? Thanks. -Ed Dudak

>Cool, Sam! I tried this on a length of aluminum angle bracket we had
>lying around, and it was spectacular.
>Jason St. John 617.353.2634
>Boston University Physics Lecture Demonstrations
>On 2002-11-07.10:35 sent:
>I bought some of those cool NdFeB magnetic spheres for various demos.
>Here's a way cooler way to show the Eddy current tube.
>First, roll the ball down a long piece of flat plastic. It's not very
>spectacular, you get just what you expect. Then roll it down a long
>piece of copper. I'm using a piece of 1/8" x 8" x 36" OFHC. The ball
>very slowly rolls down the new incline. Repeat this several times until
>the copper is vertical. It's just too cool!
>The sheet is much cheaper than the thick walled tube, and much lighter

Ed Dudak
Physics Department Technical Assistant
Grinnell College
Grinnell, Iowa