Natural Science Forum / Physics / Electromagnetism / April 2005

I would say my memory is not bad, for it keenly remembered Feynman
talking about Least Action Principle in his old book of THE CHARACTER OF
PHYSICAL LAW 1965. My memory is not at its lifetime peak but as far as
science goes, my memory is still very sharp. I can forget a persons name

If a charged particle travels through matter of dielectric properties
faster than the light in that matter, it radiates, in the direction
determined by the front of shockwave cone.
It is alleged that the intensity of the Cherenkov radiation is

I was watching a UFO program on the Discovery Channel the other night, and
they showed an enhanced photo of an alleged sighting, that had glowing
cavities on the base of the craft.
Cue one aging boffin saying "I recognise that!". Turns out he'd had some

Wikipedia has a fine entry on Principle of Least Action although most of
the ideas of that entry are wrong. Example: it says that Maxwell theory
can be derived from the Principle of Least Action.
I intuit that the correct statement is that Maxwell theory derives the

Not sure if this is the right place to answer my question, but any
pointers would be helpful.
Most texts and web sites gloss over the secondary, or HT circuit, in an
automotive points based ignition circuit. Explanations simply say that

According to Slater's book, Quantum Theory of Atomic Structure,
a simpler antecedent of the Hartree self-consistent field method
was originally applied to model the electrons in vacuum tubes and
was used, for example, to derive Child's law. Unfortunately, Slater

8192 DIMENTIONS * 8 = IS WHAT ANOTHER TIME TRAP!
PENTAGON CUDE TO SEE THE FUTURE OF OUR UNIVERSE OPTICAL WITH THE MOVIE
PAYCHECK THE SUN BECOME A 16 LIGHT YEAR BLACK HOLE THAT USED 5% OF THE
PLANETS MASS AS GROWNING EVERGY OF THE BALC HOLE!!!!

ESSENCE OF MAGNETIC FIELD
Magnetic field is composition of two electric fields in mutual
cancellation with different velocities that exist in neutral
conductors. By applying of Doppler effect to the fields whole set of

Concentric PCB Induction Balanced Coil for Metal Detectors
Hello,
I am using a concentric printed circuit induction balanced coil (ca.
20 cm diameter) for a metal detector and had phantastic measuring

I am working on the solution of the electric field of a dipole placed near a
conductor in a course and have been going through some books on the
subject.
See for instance Chen-To Tai's treatment in his book.

Alright, I understand how sparks form as current travels through the
newly-formed gas, but why do radial and concentric patterns occur on the CD?
Also, why do fractal branching patterns occur? See example image below:
http://upload.wikimedia.org/wikipedia/en/3/3c/Microwaved-DVD.jpg

Hallo:  Does anyone know why, in the diffraction theory, specifically
in the calculation of the atomic scattering factor (fa), one speak of
an incident angle.  I find it confusing since I dont know what
difference does it make at wich direction you encounter an spherically

I am a total dunce at electronics but I am working on making a device
to power several LED's for my bicycle.
So far I have a coil with about 200 feet of 26 gage wire and a magnet
inside it which 'flips' when I pass another magnet by it.  This

Please feel free to click:
- full online version of the book
NEW TRENDS IN PHYSICS
- Spheres in nuclei - images of all the spheres in nuclei