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I got a homework that confuses me totally. Any help is highly appreciated:

Here's the scenario :

http://cafeking.2page.de

Which frequencies are possible on the assumption that we have a harmonic oscillation?

The changing of the charge on the upper plate by q and the momentary elongation x should be considered.

I think 'harmonic oscillation' means that we have

x=xmax*sin(omega*t)

and its derivations as a solution for a differential equation but I can't find an accurate

the springs are made of isulating material.

I forgot to mention that we have a DC voltage, so the resistance of the capacitor is infinite. In contrast to a AC voltage it has no impendance. As a consequence of that we have a mechanical oscillation - not an electric one.

It must look like this:

m*s'' + k*s = E*q

The electric field strengh E and the carge q must be replced by given parameters whereas the charge on the upper plate is influenced by the coil - especially because of self-induction that hampers the charging on the plate.

That's all I can say. My problem is the right equation for the oscillation.

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# Electro-mechanical oscillator confuses me

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