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Old July 16th 05, 08:14 PM
Polymath
 
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for each facing pair, (ie with two fixed and one moving in
between, you'll get two faces)

C=eA/d e=permittivity of free space, A=area, d= separation.

But you must use real scientific/engineering units, not those Yank Hillbilly
ones.

"Jim" wrote in message
...
i need a variable for a receiving loop antenna. does anyone know how to
determine the area of plates for a given value of cap? for example i
need 365 pf. two half circle plates would be handy, separated by a piece
of plastic or card stock. what surface area for each plate would
approximate that value? does two stator plates with one rotor between
them increase the value if compared to one plate each?