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