Re: TC Electrosattics Revisited II

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• Subject: Re: TC Electrosattics Revisited II
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Sat, 13 Sep 1997 22:06:52 -0500
• Approved: tesla-at-stic-dot-net

From: 	Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
Sent: 	Saturday, September 13, 1997 11:11 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: TC Electrosattics Revisited II

"> leaving ke to be determined empirically. By international agreement:
>
> "A constant current of one ampere maintained in two parallel, infinitely long,
> straight conductors of negligible cross-section separated by one metre in
> vacuum, produces a force between these conductors of 2 x lO-7 newtons per metr
e
> of length."

John,

So is it correct to conclude that, under the SI unit convention, the Ampere is
determined empirically, and the Coulomb is defined as one ampere-second?


-GL
"
	NO.  The force is defined independently and the ampere, by
international agreement, is as defined.  Not empirical at all.  As
I remember, the value so defined differs by some parts per million
from the value defined by electro deposition of Ag.  Bureau of
Standards has measured current with a force balance for a very
long time.
Ed

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