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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

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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