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By rolled, I mean this kind of basic homemade capacitors:

http://www.ehow.com/how-does_4852927_building-a-capacitor.html

Kind sirs, I have few questions regarding this kind of capacitor:

1.) Would I still be able to get the 'theoretical free-space' capacitor of the same dimensions using [itex]C_o = \frac{A \epsilon _o}{d} [/itex]? I'm guessing A should be the area of the paper dielectric.

2.) For those who didn't bother looking up the link, the parallel plate capacitor is made by sandwiching aluminum foils and papers; in this case it's: foil, paper, foil, paper, in that order. My question is, this is just one capacitor right? The last paper layer is there just so the two conductors doesn't touch and cause a short circuit, which also doubles as a solid dielectric.

3.) What would be a good substitute (and cheap) dielectric if we are still to use the same set-up besides paper?

Thanks in advance.

http://www.ehow.com/how-does_4852927_building-a-capacitor.html

Kind sirs, I have few questions regarding this kind of capacitor:

1.) Would I still be able to get the 'theoretical free-space' capacitor of the same dimensions using [itex]C_o = \frac{A \epsilon _o}{d} [/itex]? I'm guessing A should be the area of the paper dielectric.

2.) For those who didn't bother looking up the link, the parallel plate capacitor is made by sandwiching aluminum foils and papers; in this case it's: foil, paper, foil, paper, in that order. My question is, this is just one capacitor right? The last paper layer is there just so the two conductors doesn't touch and cause a short circuit, which also doubles as a solid dielectric.

3.) What would be a good substitute (and cheap) dielectric if we are still to use the same set-up besides paper?

Thanks in advance.

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