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# [femm] Re: Femmview plots

- To: femm@egroups.com
- Subject: [femm] Re: Femmview plots
- From: Dcm3c@aol.com
- Date: Mon, 29 Nov 1999 22:55:43 EST
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    In a message dated 11/26/99 9:08:23 AM Eastern Standard Time,
    istokesrees@tssuk.co.uk writes:

    > should preface this in saying that I am _not_ particularly
    > knowledable concerning EM fields, so please feel free to correct me!
    >
    > After creating an axisymetric model of a single conductor current loop,
    > femmview shows the contour lines radiating outwards in the plane of the
    > loop, but the flux density |B| (the coloured plot) radiates along the
    > axis, rather than the current loop plane.
    >
    > What do the contour lines represent?
    >
    > Why does it appear that one "field strength" is maximal along r (the
    > plane of the current loop) and one is maximal along z (the axis of
    > rotation)?
    >
    > Does this have to do with the summation of the field strengths along
    > the axis?

    The contour lines represent the paths along which flux flows. The density
    plot (i.e. colors) represent the density of flux throughout the contour. The
    reason that there is a high flux density in the center of the ring is that
    all of the flux must pass through the middle of the ring, leading to highly
    concentrated flux.

    > I had this "feeling" that there was a null field line along the axis of
    > rotation, but now I am doubting that. Can someone please clarify? Is
    > there any flux along the axis of a circular symetric system?

    For a single current carrying loop, the field can be quite strong along the
    axis of symmetry. However, along the axis, the flux can have no radial
    component--it all has to flow in the "z" direction.

    Dave.
    --
    http://members.aol.com/dcm3c

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