On May 5, 8:52*am, "Szczepan Bialek" wrote:

Wiki wrote: "The field can be viewed as the combination of an electric field
and a magnetic field. The electric field is produced by stationary charges,
and the magnetic field by moving charges (currents); "

an electric field can also be created by a changing magnetic field...
and a magnetic field by a changing electric field... no charges
needed.


But what produce very slow charge?

a charge is a charge, it can neither be created nor destroyed.... well
except maybe by matter-anti-matter annihilation. charged particles
can move at any speed from 0 to c, nothing special about speeds.


Next Wiki weote: "From a classical perspective, the electromagnetic field
can be regarded as a smooth, continuous field, propagated in a wavelike
manner ;"

It is important to know that Maxwell's waves are rotational (oscillating
magnetic whirl).

no they aren't... at least not all of them. maxwells equations are
just as well satisfied by linearly polarized (magnetic AND electric
field) waves.


Alternate electric field also propagate in a wavelike manner. But here to
and fro (no rotations).

if the magnetic field is rotating then the electric field also
rotates. they always go together.


The fundamental question: Are radio waves a simple electric waves or the
very sophisticated Maxwell's waves?

ALL radio waves can be described by maxwell's equations, both simple
linear polarized ones and circularly polarized ones.