Natural Science Forum / Physics / Electromagnetism / April 2004

Dear readers,
HI-FI people tells me, that it is very important to buy expensive speaker
cable, so the signal isn't damaged my magnetic fields and other nasty
things.

According to the laws of classical electrodynamics, an accelerating
charge radiates. Since energy is conserved, this radiative emission
occurs at the expense of the particle's kinetic energy.
Therefore, under the influence of a separate force, a charged particle

While considering the cyclotron motion of a particle in a uniform
magnetic field, I'm having a hard time establishing the frame of B in my
mind. Yes, I know the apparatus creating the field is used as the frame
but it is when I consider the particle and its immediate location ...

 There are two identical metal spheres(radius a) both maintained at
constant potential V separated by a distance R. How to calculate the
force between them? and the charge distribution on the surface of each
sphere?

Does anyone know a general, classical equation for an accelerating
charges radiation reaction force? I say "general" because it seems
that the Abraham-Lorentz formula is valid if and only if the state of
the system remains invariant before and after the reaction force,

Are there any permanent magnets that don't contain iron?

If two equal and opposite charges, placed one above the other in
y-direction, are  moving with uniform velocity v in the x-direction,
then the attractive electric force Fc' in their frame S', is reduced
in the stationary frame S by a factor of gamma (g). We thus have,

Hi, I have a finite element model of a Poisson's equation problem. The
problem has symmetry along the x axis, so I only made the program for
half the physical problem. However my results are wacky along the x axis,
and it's because I haven't written the program entirely correctly ...

First consider a conductor having v as a drift velocity of electrons
in x-direction and a charge Q above it, at a distance y, moving with a
velocity u parallel to the conductor.
               Force due to electrons in S' is converted to frame S.

can a powerful magnetic field be used to "strengthen" steel of a tank
or a warship, or an airplane, or even a shuttle, by causing the iron
atoms to more strongly cohere to one another?

Im kind of curious of what the current theories of gravity are. Lets here
from everyone, what IS gravity and what causes it??

In the month of September of 1999 I ran a series of threads on whether
Quantum Mechanics can be based on triality instead of duality. In that
month I gave several supporting themes of evidence in favor of
triality. One of them was the idea that physical reality is embedded

Given that an electric field E generates a magnetic field B which in
turn generates an electric field E', will E and E' be in the same
direction?
I always assumed that E' would be opposite to E since the total

We have seen in the last article that part of the electrostatic force
that exists between the moving charges can be mathematically split
into two and the second part resembles magnetic force, at least
dimensioinally. This statement, if true, means that there is no such

I am an undergrad Electrical Engineering student.
I will be taking Electromagnetic Fields and Waves, as well as Noise
and Stochastic Process for courses in fall.
Could any of you recommend some good books for these courses so that I