Re: Since k varies but not G suggests an Eather
- From: "Randy Poe" <poespam-trap@xxxxxxxxx>
- Date: 15 Jun 2006 09:52:01 -0700
FrediFizzx wrote:
"Randy Poe" <poespam-trap@xxxxxxxxx> wrote in message
news:1150315966.145594.15400@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
The k is the same as k_e in your expression. Your expression is for the
"vacuum". Not generalized for other media.
Medium equations are merely rewritings of the vacuum equations
(which are always valid). Maxwell's vacuum equations can equally
well be applied in a medium, but it is just more convenient to
consider D and H than E and B.
Similarly, it is always valid, ALWAYS, that the total electrostatic
force felt by a charge q is the sum of k*Q*q/r^2 over all other
charges Q, including those which make up the medium, where
k is the VACUUM value. Whatever equation you are looking at
was derived from this. It isn't a separate equation, just one
which is more convenient for charges embedded in dielectrics.
It actually become much
more clear in SI units. See Jackson 3rd edition.
That's still not a reference.
How about a chapter name or number, a section name or number
that I can correlate to my 2nd ed so we can discuss the same
equations in Jackson?
Meanwhile, perhaps you want to review the derivation of the
equation you're looking at.
- Randy
.
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