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# Force at high current density

- To: femm@yahoogroups.com
- Subject: Force at high current density
- From: jim271@hotmail.com
- Date: Tue, 28 Aug 2001 16:33:06 -0000
- User-agent: eGroups-EW/0.82

    I have a question about the force on a solenoid plunger when the
    metal is saturated.

    Using FEMM, I've noticed at low current density the force is
    proportional to the current density squared, as expected for a linear
    material. As the material becomes saturated (using the non-linear BH
    curve, mu->mu_0 ), the force seems to become directly proportional to
    the current density (doubling J doubles the force). Is this the
    general limiting relationship between force and current at high field
    intensities?

    TIA

    -- Jim

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