Re: toroid shaped coil capacitance

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Re: toroid shaped coil capacitance
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Sun, 4 Jan 1998 01:47:04 -0600
• Approved: tesla-at-stic-dot-net

From: 	Norman F. Stanley[SMTP:nfs-at-midcoast-dot-com]
Sent: 	Sunday, January 04, 1998 1:34 AM
To: 	Tesla List
Subject: 	Re: toroid shaped coil capacitance

At 06:57 PM 1/2/98 -0600, you wrote:
>
>From: 	D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
>Sent: 	Friday, January 02, 1998 6:37 PM
>To: 	Tesla List
>Subject: 	Re: toroid shaped coil capacitance
>
>to: Mark
>
>Do your reference books contain any equations for the "suface area" of both
>a sphere and torus?  I'm working on an article for the TCBA and have the
>equations for capacitance but not surface area.  Thanks in advance.
>
>DR.RESONANCE-at-next-wave-dot-net
>
It's		A=4(pi^2)Rr

where the torus is generated by a circle of radius r rotated about an axis
at a distance R from the center.  (Ref. Korn and Korn, Mathematical
Handbook for Scientists and Engineers, McGraw-Hill 1961, p. 749.

Norm

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