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 1. The problem statement,
a)charges on plates are constant,
b)voltage is constant.
What happens in each case?
2. Homework Equations
$$W=\frac{1}{2}CV^2=\frac{q^2}{2C}$$
$$F=\frac{dW}{dx}\\ \text{(1)}$$
$$C=εε_{r} \frac{A}{d} $$
The Attempt at a Solution
I know that the answer is that the dielectric will be moving inward in both cases and I even have written solution but I don't understand it. I guess that I should find force on dielectric from (2) but before that i need to determine C which I don't know how to do since dielectric is in wierd position.[/B]
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