Re: Spheres vs Toroids

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Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Antonio,

The index of refraction of air at sea level is 1.0002926 (relative to a
vacuum).  You should be able to compute the speed of light in air from this
and thus the permitivity of air from the speed of light, I would think.

Gerry R
Ft Collins. CO


 > Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
 >
 > A precise measurement of c is 2.997924e8 m/s.
 > So, e0=8.854191e-12.
 > But the toroid is in air, not vacuum. Would this cause the difference?
 > I have a book here that lists e0=8.85418e-12, +/-0.000002e-12.
 > Approximating the speed of light to 3e8 m/s leads to a nice number,
 > that may cause the impression that e0 is also a definition:
 > e0=1e-12/(36*PI)=8.841941e-12
 > I will adopt your number, e0=8.854188e-12.
 > With this, I get C=40.5839741468 pF for the 90x30 cm toroid in free
 > space.
 >
 > Antonio Carlos M. de Queiroz
 >
 >