ODP: one for the theorist

Martin Czech martin.czech at intermetall.de
Wed Jul 14 17:12:54 CEST 1999


:::H field is never apart from E field, unles it is DC (well, all this
:::audio stuff is actually DC anyway...). Change in H-field makes
:::E-field and vice versa - this way we have radio waves.
:::E and H are more or less like voltage and current in Ohm law,
:::and air impedance (vacum too) is about 377 ohms, belive it or not.
:::
:::Another point - wire without return path
:::Well, for me it is antenna. Such wire has certain impedance with
:::relevance to ground, and it depends on frequency. Might be real
:::(resistance) or complex, inductive or capacitive depending on ratio
:::of frequency (or actually a wave length) to wire length.
:::
:::Roman
:::now antenna people will start to jump on me >:-P

In the meanwhile I believe that there may be a reasonable solution for a single
wire, if E and H feld are computed via Maxwell. The assumptions for low
frequency that allow to compute H in most cases may cause the trouble
in this particular case.

m.c.




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