From: Jim Lux[SMTP:jimlux-at-earthlink-dot-net] Sent: Friday, January 02, 1998 11:51 PM To: Tesla List Subject: Re: toroid shaped coil capacitance > > 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. Surface area of sphere = 4 * pi * r^2