Hi Frank, That first link was most interesting, thanks kindly.
I will need to study a bit more about what is meant by the Zemach radius and the magnetic radius. I do think that the whole concept of a "billiard ball" particle falls apart on close inspection, rather like the old Bohr model. Yet, we can still use these lumped parameter analysis to good effect. As regards the capacity, I should point out that my experience with this is pretty much all on the macro scale. Capacity is a geometric phenomena, if you can define the shape of the object and it's relation to the ground plane, and you know the permittivity of the medium in between, you can determine the capacity. As Fred pointed out in his post, in the case of the electron the radius is determined by the following equation. r = q^2/[4(pi)eo* mc^2] and you can see the energy term is "hidden" in there. But no matter how we determine the radius, we still end up with something in units of length. Now, it is an experimentally known fact ( hey, I designed plenty of HV capacitors using this formula, so it works for me at least ) that the capacity of a sphere in space is given by the following equ. C = 4*pi*e0*r So given those two things, that was my result. It confuses me as well as to how we end up with different numbers. I think we can both agree that the energy in a capacitor is 1/2*C*V^2. But as I said I'm not using that relationship at all to calculate my capacity, it being a purely geometric property. Perhaps what all this is really saying is that, if we use your derivation from energy considerations, that the resulting shape in not spherical? In which case, I would need to use some other formula to calculate the capacity... I don't know. If I get some free time I'll look over your derivation more closely, and see if I get any insights. K. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 28, 2006 9:07 PM To: [email protected] Subject: RE: [Vo]: 1.568 x 10 -25 Farads Thank you again Keith. The 3 db point on the proton is about 1.2 Fermi's. The max extent is about 1.4 Fermi. http://www.citebase.org/fulltext?format=application%2Fpdf&identifier=oai%3AarXiv.org%3Aphysics%2F0405118 http://www.infim.ro/rrp/2005_57_4/17-795-799.pdf I don't understand where the .8 Fermi radius come from. Is it a half amplitude point? My universe is 1/2 yours because I state that the energy of a capacitor is Energy=1/2 CVV You use, energy = CVV where did the 1/2 go? I am baffled. Frank z
