**From:** Doug McKean (*dmckean@corp.auspex.com*)

**Date:** Mon Mar 19 2001 - 11:13:45 PST

**Next message:**Sainath Nimmagadda: "Re: [SI-LIST] : Re: approximations for partial self inductance - WHY"**Previous message:**Ozgur Misman: "Re: [SI-LIST] : Plating Tails at High Frequencies"**In reply to:**Howard Johnson: "[SI-LIST] : Re: approximations for partial self inductance - WHY"**Next in thread:**Sainath Nimmagadda: "Re: [SI-LIST] : Re: approximations for partial self inductance - WHY"**Reply:**Sainath Nimmagadda: "Re: [SI-LIST] : Re: approximations for partial self inductance - WHY"

Well, hello people.

When discussing return paths and why they do what they do,

I'm having a problem with the statement that - return paths

at high freqs take the path of least inductance.

I've actually drawn this out and don't understand where

this came up when clearly the path of least inductance

in most cases is not directly underneath the signal trace.

Now, I have an explanation why the return path seeks to

be under the signal trace. It has to do with the Lorentz

force (the right hand rule using the Lorentz force to be

exact) and the way negative charges move in the presence

of a magnetic field. But it has nothing to do with the

path of least inductance.

The explanation is simple but, as usual, I can make rather

lengthy. So, I can post it here or discuss off-line ...

Regards, Doug McKean

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**Next message:**Sainath Nimmagadda: "Re: [SI-LIST] : Re: approximations for partial self inductance - WHY"**Previous message:**Ozgur Misman: "Re: [SI-LIST] : Plating Tails at High Frequencies"**In reply to:**Howard Johnson: "[SI-LIST] : Re: approximations for partial self inductance - WHY"**Next in thread:**Sainath Nimmagadda: "Re: [SI-LIST] : Re: approximations for partial self inductance - WHY"**Reply:**Sainath Nimmagadda: "Re: [SI-LIST] : Re: approximations for partial self inductance - WHY"

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