On 26 May 2005 16:04:05 -0700, "Tracy Hall"
wrote:

I understand that coaxial cable does not radiate much energy because
symmetric opposing current sheets in the outer skin of the center
conductor and the inner skin of the shield essentially balance each
other.

Suppose I route coax through a strong DC magnetic field, such as in an
MRI, with the magnetic field perpendicular to the cable axis. Will the
current distribution in the center conductor then become biased "up"
with respect to the field (right hand rule), and the current
distribution in the shield then become biased "down," thereby
destroying symmetry?

If so, will the coax then radiate and become lossy?

Can anyone point me to an analysis of this problem?

Thanks,

Tracy Hall
KD7AVV
hthalljr'gmail'com


Dear Tracy,

No, I don't believe that the "biasing" up and down that you refer to
will cause any destruction of symmetry, because everything is linear.
So long a linearity prevails, there will be no effect whatsoever due
to the DC field, in my opinion.



Bob, W9DMK, Dahlgren, VA
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