Natural Science Forum / Physics / Electromagnetism / January 2007

I have problem..
I have to simulate a waveguid " Earth- Ionosphere" . I use a FDTD
methood .. "Fidelity - Zeland Soft"
but my problem is that I dont understand an idea of ports..

I'm looking for comments on this patent I just stumbled across.
http://www.beckwithelectric.com/patents/06891310.pdf
It's not clear to me if they have a working device, but it
sounds like they do. If so the implications should be obvious..

I heard there are some types of radar which operate passively, this
means, they dont send any signal and dont wait for the echo, but they
get some random electromagnetic waves from the air which are reflected
on objects as well and it is possible get some image in exchange of

It is shown that an theoretical work by Loudon [Phys. Rev. A68, 013806
(2003)], experimental works by Simpson, Dholakia, Allen, Padgett [Opt.
Lett. 22, 52-54 (1997)] and Parkin, Knoner, Nieminen, Heckenberg,
Rubinsztein-Dunlop [physics/0607216] prove existence of the

Institute of Physics journals defend corporate interests rather than
interests of science. I received a message,
"It is company policy that once an article has been rejected from one
Institute of Physics journal, we cannot consider it for another",

Electromagnetism
The reasoning below shows that there is no magnetic field it is a false
concept. Iron filings are not an indication of strength at all. It is a
fallacy.

I have been baffled for some time now. Could anybody answer my question?
When I move a piece of iron away from a permanent magnet, I have to do work
on the piece of iron. Does this work enter the first law of thermodynamics
dU = DQ + DW and increase the internal energy of the iron, ...

johnreed Catch 22 - January 10,  2007
from johnreed take 1A - Parts 3 & 4 - October 18, 2006
John Lawrence Reed, Jr.
Isaac Newton defined centripetal force in terms of his second and third

E=mc2   not quantitatively confirmed in bombs exploded on Hiroshima
and Nagasaki in 1945 ? There is no data how much mass (m) is destroyed
and how much energy is emitted (E).
           (i)   Robert Serber (member of first American team entered

Wikipedia is a really good website. I looked up the article on
"photons" a
few months ago and was especially impressed by how well it dealt with
the topic

In Wikipedia under "Magnet", "Force between two bar magnets" is an
equation to approximate the force between two bar magnets. I assume it
is creating a correction factor to the basic force equation between two
close surfaces of F = AB^2/2u0

~~
~~~
yo Tom!
It IS funny, being on the internet, where

A few questions:
1) I just built a little circuit to power a table lamp with 9v
batteries as a science demo for a high school class. I put 13 batteries
in series and the lamp lit fine. Yes, I know it is DC. Anyway, I got to

As you know there is an electrical field around each electrostatic
charge. I know how to create an electrostatic field. But I have problem
by creating a "variable electrostatic field". Can you give me a guide?
Thanks in Advance