Natural Science Forum / Physics / Electromagnetism / June 2005

http://csep10.phys.utk.edu/astr161/lect/earth/magnetic.html
The above mentions that "The origin of the Earth's magnetic
field is not completely understood, but is thought to be associated
with electrical currents produced by the

To create source of magnetic field. You only need wires as
the current passing thru them can create it. The electric
field in the wires is null because there is a cancellation
inside the positive lattice and electrons.

When you pass a wire through high-permeability material the inductance
increases, because the flux produced by the current increases.  It's
easy to see how the same H field now produces a greater B field which
increases the inductance.  The H field of a closely-spaced pair of

Can the cross product of threedimensional vectors be generalized to
relativistic 4 - vectors ? What does mathematics say ?

Suppose you have a current source with magnetic field
and you want to reduce it by adding a metal near it
to induce opposite magnetic field to cancel the one
from the source (partially). What coil configuration

White I do not have a science background in the last 11 years I have
done a lot of searching on the internet because in 1994 I starting
"hearing" what I call an
acoustic nightmare. without any knowledge of what was going on I did a

When helicopters fly, they get charged electrically.
This is such a strong effect, that the shock can kill
a man, especially if it has heart problems.
Why do thy charge up?

On 2004-05-26 23:56:58 PST Timo Nieminen (timo@physics.uq.edu.au)
wrote:
Radi, you might be interested in our recent paper:
http://link.aps.org/abstract/PRL/v92/e198104

Electromagnetism and str -
what's wrong in my formulas?
    Two electrons move in parallel perpendicular to the line between
them, and the two have the same velocity. This is how it's seen from

right?
This means the 12volts/18ampere setup produce larger
magnetic field magnitude (from the current flow) than
the 110volts/2Ampere setup (noting that both produce the

does anyone one have any idea if the bebe sounds infant movement monitor
emits electromagnetic radiation?  the device consists of a pad that is
placed under the crib mattress and pics up movement (or lack of movement) by
sending a signal to a base monitor that is run by 4 AAA ...

Suppose you have voltage = 110 volts and current 2 Ampere

Power = 220 Watts
Suppose you have voltage = 12 volts and current 18.3 Ampere

In a moment of brilliance, Louis Savain Ph.D. declared:
(Anyone disagree to the following, why?)
"The truth is that the
magnetic field of moving particle is due almost entirely to its having

Amazing! Mark W. tipped me off that Ikea is currently selling bowls in
the form of near perfect rimless steel hemispheres, 5", 8", 11", and
14" diameter.  $3 for the 5" ones.
http://www.ikea ...

Can anyone explain how magnetic field is really a
relativistic effect of moving electric field?
Is this an empirical and irrefutable fact supported by
experiments?