Dear Greg Neill:

"Greg Neill" wrote in message
m...
....
No, in a propagating transverse electromagnetic
wave the electric and magnetic fields may be
orthogonal, but they are in phase.

In a vacuum they are in phase. As a medium in interposed, the
phase relationship changes. When bound to a conductor, and
"pushing" charges around, they are 90 degrees out-of-phase.

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

David A. Smith