Natural Science Forum / Physics / Electromagnetism / February 2007

apologies in advance for being unknowledgeable about the subject and
about to ask embarassingly stupid questions.
Basically what I have  (or will have, I should say,) is some weak
magnets set in wood that hold some other wood painted with metal paint

Wondering about the change of the phase of an EM plane wave by
reflection from a mirror and whether it depends on the incidence
angle.  Any suggestions?

I'm currently taking course in microwave engineering (and maybe I
should already know this) but, what exactly is the difference between
the wavenumber k and the propagation constant beta.  Is it that
k=w*sqrt(permeability*permittivity) and beta is the real part of k

For a project I am looking for a supplier of small cylindric ferrite
rods. 1mm diameter and 10mm length is available from fair-rite in
their material 61 (µi=125), this looks quite fine for the first part
of the project.

I have a pretty difficult problem that I would really appreciate some
help in solving.
I need to measure the current induced in a conductor by a strong
magnetic field.  I need to do this without using any conductive

Thank you for making me get off my butt and do some analysis (and also
correct some stupid errors).
I would like to correct part of what I said.
"With these conditions, the result is that the stored energy in the gap

DEARS
Is it possible to produce a gradient magnetic field using three
orthogonal current coils ?
with the highest gradient point at the center of the coils ?

When Negative Beta particles (which are excited electrons) are deflected by
a magnetic field, they are deflected in the direction of the South magnetic
pole (according to what I read), which means that they must be attracted to
the South Pole and rejected by the North Pole. Does ...

I have a problem and I would appreciate if somebody can help me threw
it.
I am trying to calculate the amplitude of a picoseconds pulse after has
propagated a distance within a superconductor. The following steps were

I am concern about my understanding of the inductance formula of a
coax cable which is
L = u0 * l /(2*pi) * ln(b/a)
u0 is the permittivity,