Re: [SI-LIST] : Re: approximations for partial self inductance - WHY

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From: Sainath Nimmagadda (
Date: Tue Mar 20 2001 - 17:43:36 PST

Dear JuYoung,

JuYoung Lee wrote:

> Michael,
> Good point.
> In Physics community, people often say about gauge attached to vector
> potential A. A is defined by curl A = B. You can attach any gradiant
> of function X (gauge) to A without affecting E and B field according
> to Maxwell equation form. So A' = A + gradient X and there are
> infinitely many options of A'.
> One interpretation is that A' is partial inductance per unit length.

Checking dimensions: in curl A = B, A has the units of webers/m or
Volt-Sec/m. From above interpretation, A' has units of Henry/m or
Volt-Sec/Amp/m. Am I missing something here?


> Field solvers often use A'. As long as one sticks to a particular
> choice of X consistently, the potential error in using partial
> inductance can be avoided.
> And X is supposed to mean "nonexistence" in electromagnetics. In
> quantum physcis it means something related to phase of photon.
> Regards,
> JuYoung

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