On Apr 23, 2:29*pm, Roy Lewallen wrote:
* steveeh131047 wrote:
Cecil: that's a VERY significant result. If I feed the dimensions of
W8JI's coil into Equation 32 in the Corum Bros paper it predicts an
axial Velocity Factor of 0.033. That would equate to a time delay of
24.7nS across the 10" long coil !!!!

Regards,
Steve G3TXQ

Let's see how well the principles involved are understood.

What is the delay through a physically very small toroidal coil with the
same inductance as the solenoidal coil? Why?

Roy Lewallen, W7EL

A toroidal coil retains magnetism via hysteresis versus zero
hysteresis for a coil made of a diamagnetic material. A coil is in
equilibrium because all forces are accounted for
over one or more periods. A toroidal coil is not in equilibrium
because the energy that provides the hysterisis happens only once per
unit of time where as for equilibrium that same energy is provided for
every period and cancelled by same.
If a unit of energy is supplied to a radiator in equilibrium then the
unit of energy must be added to or increased to represent the
hysteresis lossesof the toroid The ratio of the original unit of
energy will represent the difference in time or delay required to
represent balance between the two. The above is based on a coil in the
medium of air and not magnetic core as the term "solenoid" suggests.
Roy doesn't see my posts either so somebody else has to pass this on.
Art