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HappMatt
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Homework Statement
A parallel plate capacitor is used as a vibration sensor. The plates have an area of 100cm^2, the dieelectric is air, and the dist between the plates is given by
d(t)=1+.01 sin(200 t) mm
A constant voltage of 200 V is applied to the sensor. Determine the current through tthe sensor as a function of time by using the aproximation1/(1+x) = 1-x for x<<1.
Homework Equations
C=(1*10000mm^2)/(d(t)
i(t)= C* dv/dt
The Attempt at a Solution
this is about as far as i have gotten because I am not sure how to approach this exactly because I am not sure what the dv/dt is since i know it has a constant voltage across it there is 200 v across the capacitor but that leaves me with dv/dt =0.