Natural Science Forum / Physics / Electromagnetism / September 2006

I have a question about the near filed operation of antennas or
radiators.
1) Are the fields in the near field area nonlinear ?
2) Can near fields interfere with one another?

Can someone out there tell me why this model wont work.
Get a donut shaped perfectly circular magnet, with the north pole on
the inside of the hole, and the south pole on the outside of the donut.
Place a bar magnet on the exact center of the hole with an axle punched

I want to design a generator using a permanent magnet as the center
stator and a ring of coils in a circle that rotat around the magnet,
thereby generating an electric current as the coils move through the
magnetic field of the permanent magnet.

I have the following questions:
1) How can we convert a *vector* from the rectangular coordinate system
to spherical?
2) How can we add two vectors in the spherical coordinate system (w/o

Two parallel conducting planes (C) are
placed in a uniform, time-invariant
electric field (E) normal to the
conducting planes.

According to D. Griffiths, the polarization energy corresponds to
stretching the dielectric molecules. He writes that if we picture the
positive and negative charges as held together by tiny springs, the
spring energy, associated with polarizing each molecule, must be taken

According to "PHYSICAL REVIEW A EDITORIAL POLICIES AND PRACTICES"
authors may appeal a rejection of their paper by the Editor(s). In the
case of a formal appeal, the paper will be sent to a member of the
Editorial Board. But Dr. Drake did not send my paper properly. So, I am

I have a simple physics question, which I wonder if somebody could help
me with as I am a computer science person trying to use Coulomb force as
an error metric.
In 3D space, if I have a charged rod, (length l with start and end