Originally Posted by Koyaan I. Sqatsi
I don't recall saying anything about the signal being the same if you're just using ONE wire.
Please, take my advice and just stop, right now. You have absolutely no clue what you're talking about here. None.
Great. Then let's see an example of this.
While thinking about the example I was thinking about a coax cable, but then I remembered that it is shielded so that would be different from qusp's example. So I was definitely thinking about the wrong thing while reading his example but if you do have two wires and for arguments sake have them both teflon insulated and separated say a 2 inches from one another, you wouldnt have any parasitic capacitance due to the other wire. Actually its pretty odd thinking of regular single wires and capacitance, when I think capacitance and induction Its usually with coaxial cables because of the electromagnetic interaction between the signal and ground. The only time I could see wires having capacitance would be if they were twisted or very close to one another, otherwise, the electric fields are not powerful enough to do anything against air.
Looking at cables I've worked with, capacitance ratings are only given to wires that come in twisted pairs or coaxial in nature (some form of signal + ground/shield). So to describe or attribute capacitance to Qusp's example (should I understand it now) is a mistake. Wouldn't the two wires be independent from one another? And if they never have this "polarization" of charges, you can't store any energy in between can you? Could there ever be a potential difference between the two? Between the ground and signal, yes, I think capacitance could exist, particularly since there would be this charge polarization and potential difference between the two.