RE: [femm] nonferrous electromagnets

["Joe" <jflynn@xxxxxxxxxxxxxxxxx>]

I have not really thought this thru, but it seems that if the electromagnet
is AC at some given frequency, currents would be induced in a conductive
material ferrous or not (such as an induction furnace used for smelting
aluminum). These induced currents would also have a B field, if a second
conductor has the same frequency in phase with the induced field in the
conductive material then the two would repel, 180 out of phase they would
attract. I recall an old experiment where either a copper or aluminum disc
is placed on top of an electromagnet and when the electromagnet is pulsed
the disc is repelled from the electromagnet.

Joe Flynn
jflynn@xxxxxxxxxxxxxxxxx

-----Original Message-----
From: sunshine_80918@xxxxxxxxx [mailto:sunshine_80918@xxxxxxxxx]
Sent: Sunday, February 10, 2002 10:41 PM
To: femm@xxxxxxxxxxxxxxx
Subject: [femm] nonferrous electromagnets


Hi all. Been thinking about a project involving nonferrous
electromagnets, attracting metal with low electrical resistance like
copper, alluminum, gold etc... Want to know if anyone here knows
anything or has any experience with this subject. I have searched
the archives and found no mention and what I did find did not
understand much. I have a book on order about how to make one,
just being impatient and thought someone might know from
experience. Thanks for your time, Mark






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