Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!gwyn From: gwyn@brl-tgr.ARPA (Doug Gwyn) Newsgroups: net.physics Subject: Re: Magnetic Levitation Message-ID: <567@brl-tgr.ARPA> Date: Fri, 9-Aug-85 04:44:37 EDT Article-I.D.: brl-tgr.567 Posted: Fri Aug 9 04:44:37 1985 Date-Received: Mon, 12-Aug-85 01:23:47 EDT References: <249@weitek.UUCP> Organization: Ballistic Research Lab Lines: 23 I don't know how the eddy current magnet you saw was constructed, but one can be made as follows: --------------------------------------- --------------------------------------- ooooooooooooooooooooooooooooooooooooooo ooooooooooooooooooooooooooooooooooooooo --------------------------------------- --------------------------------------- --------------------------------------- ooooooooooooooooooooooooooooooooooooooo ooooooooooooooooooooooooooooooooooooooo --------------------------------------- --------------------------------------- (This is a cross-section of a cylindrical magnet with its axis of symmetry running horizontally. "o" is the copper wire and "-" is soft iron.) A magnet like this (actual size, using 10-pitch printout) will easily lift a quarter when powered off a hefty AC supply. This is the result of the induced eddy current in the quarter being opposite the main field of the magnet.