On 31 Oct 2005 09:35:09 -0800, "lu6etj" wrote:

PS: I have another physical doubt, if you can help me.
Can a real DC current radiate electromagnetic energy?.
It is not captious [capricious] or cheat [trick] question. I think yes, but I don't want to
condition your answers with my hypotesis.

Hi Miguel,

A "real" DC current?

Yes.

A "real" DC current (at some point in time) starts - and stops. It is
at each of these two points that the step change offers radiation. The
"time" it takes to go from one level to the other defines that
frequency, and its harmonics.

A "perfect" DC current has always been on, and will always be on. No
change, no radiation.

73's
Richard Clark, KB7QHC