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# Determining inductance per meter with 2D analyses

- To: femm@yahoogroups.com
- Subject: Determining inductance per meter with 2D analyses
- From: "gopherlid" <macy@california.com>
- Date: Thu, 12 Sep 2002 13:32:37 -0000
- User-agent: eGroups-EW/0.82

    Anybody have an idea how to calculate inductance per length?

    I tried using the formula 1/2 L I^2 = Energy

    but the Energy value changed too much based upon number of nodes.
    We're talking 100% It's as though, more nodes, more energy with no
    asymptotic limit in sight!

    It's a very simple structure, a wire with a slab of metal around it,
    so the results should be straight forward. However, the "magnetic
    field energy" seems to relate to the number of nodes *and* the number
    of nodes in the metal, which makes no sense, since there is less than
    0.01% energy in the metal. But changing the nodes in the metal
    actually made the inductance change by a factor of 2:1

    Any ideas? Plus ideas on how to know when enough is enough?

    - Robert -

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