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# Re: [femm] nonferrous electromagnet

- To: femm mailing list <femm@yahoogroups.com>
- Subject: Re: [femm] nonferrous electromagnet
- From: David Meeker <dcm3c@earthlink.net>
- Date: Tue, 12 Feb 2002 08:17:48 -0500

    Well, I guess it's possible to make a magnet that would push objects
    that are conductive but not ferromagnetic towards itself. The first
    example that I could think of was two concentric coils that have
    currents flowing in opposite directions. At some point along the axis
    of the two coils, the fields of the two coils cancel each other out. If
    you put a small conductive object (like a copper disk) just outward of
    the "dead spot," it would tend to be pulled in, towards the dead spot.
    The same idea also seems to work if the inner coil is made into a
    shorted turn. I've attached some examples. Note, however, that the
    region in which the conductive disc is attracted rather than repelled is
    limited--if you go farther out on the axis, the force direction switches
    sign.

    Dave.
    --
    David Meeker
    http://femm.berlios.de/dmeeker

Attachment: `zip00023.zip`
Description: Zip compressed data

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