So as I understand it, you want something like a Van de Graff generator
that has a voltage that you can control? All (or most) Van de Graff
generators work by slowly charging up, and then discharging, e.g., when
a spark forms.
It might be possible to construct a variable resistor from the Van de
Graff to ground. But be warned that this will be no ordinary resistor.
You would need an incredibly large amount of ohms, and it would have
to hold off thousands of volts.
A simpler way would be to bring up another conductor up "behind" the
sphere that holds the Van de Graff generator's charge. That would
polarize the sphere, and the "front" would contain less charge. By
"front" of the sphere, I am referring to the space where you want to
produce the field.
Or, you could change the speed of the belt. How quickly do you want to
vary the voltage?
Guy
http://faculty.valpo.edu/gvandegr/
mohammad.esmaeili@[EMAIL PROTECTED]
wrote:
> Thanks for your answer...what I need is an variable electric field like
what
> we see in a "Van de graaff" (that is limited just from one side).
|
