Re: E field Angle
- From: Jos Bergervoet <Jos.Myname@xxxxxxxxxxx>
- Date: Thu, 31 Aug 2006 15:04:58 +0000 (UTC)
Bill Miller wrote:
Theoretically, the Electrical (E) field associated with a conductor is at
exactly 90 degrees with respect to that conductor.
Only for a perfect conductor, or for a DC field.
It appears, however, that real conductors behave diffeeently and that theE
field associated with a real conductor is at an angle that is slightly
displaced from 90 degrees.
It is pointing slightly forward for an AC current, in a way that
gives a Poynting vector slightly inwards to the material. This inward
component of the energy flux corresponds to the losses in the material.
Cu,
What are the parameters that govern this angle, and what is the range of
angles that is likely to be encountered with typical conductors such as
Al, Ag and others?What angular difference (if any) is there between a DC
field and an AC field with the same peak V/M amplitude?
The inward energy flux vs. forward flux (from the Poynting vector) gives
you the angle. For a linear wire, for instance, you can easily integrate
the values. So it comes down to knowing the losses in the wire, compared
to the total AC power transported. I leave the details to you!
-- Jos
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