Re: Capacitors and resonant frequency
- From: Baron <me@xxxxxxxx>
- Date: Sun, 29 Oct 2006 20:50:34 +0000
meyousikmann wrote:
I have a problem that asks about the movement of the second plate of a
capacitor in order to change the resonant frequency by 10 ppm in an LC
circuit. I am getting stuck in terminology.
Here is the information given:
Area of each capacitor plate (one attached to solid nonmoving post
while other can move small distances perpendicular to the plates)
.01 m^2
Initial plate separation
100 micometers
Inductance
120 nH
I have found the initial capacitance and frequency, but the second
part of the question says "How far must the second plate move to
change the resonant
frequency by 10ppm". I am not entirely sure what this question is
asking
for. Where does ppm fit into any of the calculations. I don't want
answers, but I would appreciate if somebody can translate the question
into something I might understand.
Think about the definition of a capacitor ! The value of capacitance
for a fixed plate area will vary in inverse proportion to the
separation !
--
Baron:
.
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