Date: Fri, 26 Sep 2003 15:12:33 -0500

Author: Gary Karshner

Subject: Re: Awesome EM induction demo!


Remember that copper is not ferromagnetic the field can pass right through
it, so increasing the thickness helps.

>>Does the copper really need to be this thick? The induction current is not
>>very deep, so in theory a piece of 1/16" or thinner sheet should work just
>>fine, except for staying cold. I was thinking of using a 1/4" x 12" sq.
>>piece for weight and $ considerations.
>>Tom Bauer
>>Wellesley College
>The induction current is at least as deep as the magnetic flux penetrates
>the copper -- and that's a few inches. Furthermore, the resistance of the
>copper is markedly decreased with an increase in thickness, so you end up
>with a larger current and bigger effect for thick pieces. Wolfgang
From MLowry@D115.ORG Fri Sep 26 14:30:18 2003