Natural Science Forum / Physics / Electromagnetism / November 2007

hi guys n gals
i am a fresh one to EMT and i am facing difficulty in understanding
the transverse electromagnetic wave. I mean how does a component of
TEM in x-direction can vary along all three directions and still

We know that when an in-phase radio frequency signal is applied to a
conductor, the conductor will radiate a portion of the applied signal. If
the physical configuration of the conductor is conducive to radiation, then
all (neglecting I squared R losses) of the applied signal ...

       First I should mention that my knowlege of electomagnetics is
somewhat limited.  In fact I think it could all be written onto the back of
a postage stamp with a lipstick.  A hobbyist at best.
A few weeks ago I read some interesting stuff regarding recent experiments

Apparently since no one in the group has come up with the wavelength
or energy level of a virtual photon, I must assume that the concept is
highly theoretical.
skeptical turtle

I was simply wondering where one might get materials to build the
Lifter such as the Balsa wood and the power supply to power it and
make it lift.
Thanks in advanced for any answers.

Is a sheet of copper good enough to block mobile phone radiation?

Hi everybody! A quick question, taking for example a common DC
electric motor used in most of the toys ¿how many turns, commonly, has
one of the  windings of this motor? (I guess the other windings has
the same number of turns). I know I´m not giving any additional data

NEW Stem cell research from adult skin cells has no limits on what
can
result and way back in the ending
years of the last century or sometime in the mid to late 90s when I

The new, twenty-first edition of the freely
downloadable physics textbook is available on
    http://www.motionmountain.eu
Almost 1500 pages lead through the whole of physics, from

the purpose of this question is to possibly design a practical
generator using a torrus shaped magnetic field.
because a torrus is circular the field is self shielding and
concentrates the flux lines at the core. It would be a good place to

What is the inherent disadvantage if any to a stepper style motor scaled up
to
the 1/4 hp to 1/2 hp range.  Using 16 to 24 NdFeB Disc, 1 in. x 1/4 in.
12,700

List of Solution manuals:
Engineering Circuit Analysis 6Ed - Hayt Solutions Manual
Norbury - Solutions manual for mechanics and thermodynamics
Physics For Scientists And Engineers - Solution Manual

The basic idea is the same as a standard stepper motor using
http://www.gaussboys.com/ndfeb-magnets/D3712E.html
This is a very popular magnet that is almost impossible to separate
without the use of a table edge or some sort of sliding mechanism.

Your opinion to the following will be appreciated
Lets imagine a sphere made of a conductor (copper) placed within a
static magnetic field. The field will penetrate the within the shier.
Next we place inside the sphere a coil producing a variable