Re: [Phys-l] defn of capacitance

["Bob Sciamanda" <trebor@winbeam.com>]

Wangness' text "Electromagnetic Fields" begins with  Vi = Pij Qj , shows 
that the Pij's are functions only of geometry, and finishes his treatment by 
asking the reader (in an end of chapter problem) to show that this can be 
inverted to yield Qi=Cij Vj .  Your paragraph 1.7 seems to say that this is 
impossible. . .  What am I misunderstanding?
----- Original Message ----- 
From: "Bob Sciamanda" <trebor@winbeam.com>
To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>
Sent: Monday, February 11, 2008 3:38 PM
Subject: Re: [Phys-l] defn of capacitance


> Textbook treatments of this subject include a proof that the Cij's are a
> function only of geometry.  This is an important part of the usefulness of
> this model.  Your treatment does not seem to include this point.
> ----- Original Message ----- 
> From: "John Denker" <jsd@av8n.com>
> To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>
> Sent: Friday, February 08, 2008 8:10 PM
> Subject: Re: [Phys-l] defn of capacitance
>
>
> > Hi --
> >
> > Recently I reorganized and greatly expanded my discussion
> > of the definition of capacitance and the procedures for
> > calculating capacitance matrices.  I decided to give it
> > its own web page:
> >  http://www.av8n.com/physics/capacitance.htm
> >
> > Note that formerly this was just a subsection of the page
> > on solving Laplace's equation numerically using spreadsheets:
> >  http://www.av8n.com/physics/laplace.htm
> >
> > Keeping these two topics separate seems to be an improvement.
> > Let me know if there are any questions, suggestions, et cetera.
> >
> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@carnot.physics.buffalo.edu
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>
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