Michael Foster wrote:
Stephen A Lawrence wrote:
You've said two different things here: the strength of the
field will drop, and the voltage drops. The dielectric will
_certainly_ affect the voltage, just as interposing a charged
parallel plate capacitor would affect the voltage (which would
Stephen A Lawrence wrote:
You've said two different things here: the strength of the
field will drop, and the voltage drops. The dielectric will
_certainly_ affect the voltage, just as interposing a charged
parallel plate capacitor would affect the voltage (which would
reduce it by the
I wrote:
There is a fundamental problem with this idea. While the earth
has a net negative charge of say, one megajoule, the tiny
fraction of a joule per square meter just won't supply the
repulsive force you need unless your Van de Graaff spacecraft
is very large and already elevated.
Michael Foster wrote:
I'm trying to figure out how a couple of guys who are clearly
better educated, and probably a lot smarter than I, can have
gone so far wrong.
OK it's time to point out something trivial.
divergence(E) = 4 pi rho (in cgs units)
E is the real electric field (not the
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