Re: Charged disk; was electrostatig

[Ludwik Kowalski <KowalskiL@MAIL.MONTCLAIR.EDU>]

No, I do not disagree; you can make a disk which is more or
less cylinder-like. My intuition suggests that a cylinder with
very sharp edges will have most of its Q near the edges.
The S(r) distribution will be like a delta function. But why
should my intuition be trusted? I am only saying that a real
disk is not a mathematical cylinder.
Ludwik Kowalski

Leigh Palmer wrote:

> > As I explained a minute ago, it is better to avoid a cyliner
> > because it has sharp edges. To be realistic you must
> > assume they are not "infinitely sharp" and intruduce
> > the radius of curvature at some level. I suggested that
> > we do this at the level of the thickness. The surface
> > of the disk becomes smooth.
>
> There is no problem inherent in sharp edges. Total charge
> converges in a well-behaved manner, even if charge density
> does not. Do you disagree with my cylinder-to-disc sequence?
>
> Leigh