From: r_delaney2001@yahoo.com   
      
   On February 12, Phil Hobbs wrote:   
   >> Looking at network theory and the duality theorems,   
   >> why is there no mutual capacitance?  i.e. electric   
   >> flux linkages, symmetric to mutual inductance and B flux.   
   >   
   > There is.  It's usually just called 'capacitance', unless you need to   
   > distinguish it from self-capacitance.   
      
   I picture the analog of two isolated coils, magnetically   
   linked: two isolated capacitors, the flux of the 'primary'   
   transmits through the 'secondary'.  Why no such device?   
      
      
   > A 1-cm radius isolated sphere has a self-capacitance of 1 cm (Gaussian   
   > units), which is about 1.12 pF.   
      
   Well, I have in mind your basic two plate capacitor.   
   I don't recall self-capacitance -   
      
   --   
   Rich   
      
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