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From: email@example.com (Roy McCammon)
Subject: Re: Deriving H for magnetic cores
Date: Wed, 18 Dec 2002 12:15:50 -0600
References: <3DFF8FA6.4593A00A@mmm.com.DELETETHIS> <3DFFE9DB.1BEFBBE3@earthlink.net> <3E008AB8.141E41D5@mmm.com.DELETETHIS>
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"Christopher R. Carlen" wrote:
> Roy McCammon wrote:
> [nicely worded discourse snipped]
> > 2. A contour such that | H | = constant. You probably
> > mean it in this sense. That seems plausible, (requiring
> > only continuity?), but that sense doesn't pertain to the
> > discussion because in the special case we needed the
> > fact that H . dL = constant on the contour of interest.
> > 3. A contour such that H . dL = constant
> Wouldn't it be actually true that the "contour of constant H" in which
> we are interested is the one in which H=|H_vec| is constant (your #2),
> since then you could take H (scalar magnitude) out of the integral,
> which is the necessary mathematical step to make use of Ampere's Law.
No, that is not sufficient. You need the component of
H that is tangential to the contour to be constant. If
that is so, then the integral of H . dL becomes a constant
> Then you would *just* have to be able to express the unit vector of H in
> terms of r, phi, and perhaps z. Not that this would be possible of course.
> Aren't integrals like this parametrized so that you would integrate a
> parametric vector function that would follow the contour over which H is
> constant and in which the unit directional component is expressed in
> terms of the parameter?
> Good day.
> Christopher R. Carlen
> Principal Laser/Optical Technologist
> Sandia National Laboratories CA USA
Thank you for reading and or replying
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