[SI-LIST] Re: how EM wave propagates through space
- From: Ihsan Erdin <erdinih@xxxxxxxxx>
- To: S A <shahbaz_assad@xxxxxxxxxxx>
- Date: Tue, 4 Oct 2011 10:22:08 -0400
Shahbaz,
A few corrections to your assumptions follow. First, the electric field is
due to the charge (electron) itself not its motion. The charge motion is
attributed to the magnetic field but indeed magnetic field originates from
the spin properties of matter which is a more complex quantum effect. You
can find a good presentation of this subject in the following portal
http://en.wikipedia.org/wiki/Portal:Electromagnetism
The second issue is that you don't need conductors for field propagation. EM
fields will propagate in vacuum, as well. Maxwell-Ampere law relates the
time varying electric field to the curl (rotation) of the magnetic field
through displacement current. In other words, a time varying electric field
generates magnetic field. Maxwell-Faraday law, on the other hand states a
time varying magnetic field is the source of electric field. The interleaved
generation of the electric and magnetic fields from one another is the cause
of energy propagation in the permeating field at the speed of light.
Regards
On Tue, Oct 4, 2011 at 5:38 AM, S A <shahbaz_assad@xxxxxxxxxxx> wrote:
>
>
>
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> Hi Experts,
>
> My question is related to propagation of EM waves.
> As EM waves have electric field and magnetic field and as we know that
> electric field is due to the motion of electrons and require some conducting
> medium.But I am confused that how EM wave propagate through space. what
> happens to the electric and magnetic field?
> I am sorry my question is very basic. but what happens to the electric and
> hence magnetic field in space and how these fields exists in space.
>
>
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> Thanks,
> Shahbaz Assad
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--
Ihsan Erdin
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