I can't say anything authoritative, but I suspect that a (quasi?) parabolic discontinuity in dielectric constants between the plates might do something like that.
Regards,
Bill
This is an interesting description that begs a question:
If three masses are placed at the corners of an equilateral triangle, and the "force" on anyone corner can be determined using the "center of gravity" of the other two corners, does the "deepest point in the valley" occur at any...
This is somewhat obfuscated. A beam "partially reflected by a series of mirrors" would not be traveling "directly outwards from the moon".
Regards,
Bill
First, you have to think of a closed surface - I prefer a sphere.
The curl is everywhere tangential to the sphere (whereas divergence is perpendicular).
If you have access to IEEE papers, you might try looking for a paper (circa 1978) by Dr H. Thal regarding an exact circuit analysis of...
I don't know about you, but my ears are nowhere near a half wavelength in dimension with respect to what "radiation" they can detect. :smile:
Look for info on "radiation resistance" to see why small apertures (<<wavelength) are not efficient antennas.
Regards,
Bill
If the ball is on an inclined plane relative to gravity, the force on the center of mass does not pass through the point of contact with the plane. Therefore, I think you are incorrect that there is no torque on the ball.
Regards,
Bill
If so, that would be a different problem.
Perhaps a hemisphere of pointy electrodes (directed inward) would work in a similar fashion - with the center of the sphere as the "focus" of the static field.
Regards,
Bill
Look for info on "gregorian antenna". A gregorian antenna uses an ellipsoidal subreflector to feed a parabolic main reflector (the ellipsoid and parabola have a focal point in common).
Regards,
Bill