[SI-LIST] Re: how EM wave propagates through space
- From: vinod ah <ah.vinod@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 4 Oct 2011 20:08:10 +0530
Hi All,
Can anyone please explain the EM wave movement in free space rather than
going into equations. It is very easy to quote Maxwell's equations & complex
mathematical derivations to explain but physically how does the
wave propagate as we know that for electric field to exist there should be a
charge and free space has no charge!!!.For magnetic field to exist the
charge should be in motion and if charge is only not there where is the
point of motion!!! If i am wrong do correct me.
Regards
Vinod A H
EchoStar Corporation
On Tue, Oct 4, 2011 at 7:52 PM, Ihsan Erdin <erdinih@xxxxxxxxx> wrote:
> 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:
>
> >
> >
> >
> >
> > 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.
> >
> >
> >
> >
> >
> > Thanks,
> > Shahbaz Assad
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
>
>
> --
> Ihsan Erdin
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
