On Monday, Apr 19, 2004, at 03:53 US/Pacific, Gerhard Fiedler wrote:

>
>> Ohm's law refers to circuits, though.  Not static fields or
>> components?
>
> My question here is whether "static fields" isn't a simplification for
> saying "/very/ low current situations".

No.  Get into things like electron microscopes or particle
accelerators, and electric fields become things very distinct indeed
from currents.

What would your static magnetic field represent a "very low current"
OF, anyway?

Heisenberg's uncertainty principle enters the picture if you actually
want to MEASURE zero, of course.  While it's usually thought of in
terms of the uncertainty of a non-zero value, measuring exactly zero
violates it just as ... certainly.

(or...  Think of most of electronics as a "bulk" simplification of
electron physics.  Things like single electrons clearly have an
electric field, whether they're involved in current flows or not...)

BillW

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