[Craig, previously]
> The [opposite] poles [of magnets] are attracted to each other even
> when no
one is aware of > it.
Craig,
Magnetic forces are forces that arise from the movement of electrical
charge. Maxwell's equations and the Biot-Savart law describe the origin
and behavior of the fields that govern these forces. Thus, magnetism is
seen whenever electrically charged particles are in motion. This can
arise either from movement of electrons in an electric current,
resulting in "electromagnetism", or from the quantum-mechanical spin and
orbital motion of electrons, resulting in what are known as "permanent
magnets". Electron spin is the dominant effect within atoms. The
so-called 'orbital motion' of electrons around the nucleus is a
secondary effect that slightly modifies the magnetic field created by
spin.
The magnetic force is actually due[3] to the finite speed (the speed of
light) of a disturbance of the electric field which gives rise to forces
that appear to be acting along a line at right angles to the charges. In
effect, the magnetic force is the portion of the electric force directed
to where the charge used to be. For this reason magnetism can be
considered to be basically an electric force that is a direct
consequence of relativity.
-Ron
moq_discuss mailing list
Listinfo, Unsubscribing etc.
http://lists.moqtalk.org/listinfo.cgi/moq_discuss-moqtalk.org
Archives:
http://lists.moqtalk.org/pipermail/moq_discuss-moqtalk.org/
http://moq.org.uk/pipermail/moq_discuss_archive/
