XPost: sci.electronics.design   
   From: tiwill@seventransistorlabs.com   
      
   B is flux density: wrap a loop of wire around a given cross-sectional area,   
   of uniform flux density B, and you get B*A flux in that loop (which if the   
   flux is changing, you can do Faraday's law, etc.).  Who knows what current   
   flows in the wire.   
      
   Conversely, put some current into a loop of a given perimeter, and you have   
   some magnetic field intensity H within it (give or take geometry, of   
   course).  Who knows how much flux that took.   
      
   In space, the ratio of these two happens to be mu_0.  Or at the terminals of   
   the loop, its inductance: H == V.s / A.  For general materials, use mu =   
   mu_0 * mu_r, and the effective cross sectional area A_e and effective path   
   length l_e.   
      
   Tim   
      
   --   
   Seven Transistor Labs, LLC   
   Electrical Engineering Consultation and Design   
   Website: https://www.seventransistorlabs.com/   
      
   "Tom Del Rosso"  wrote in   
   message news:racu90$svq$1@dont-email.me...   
   > Reviewing stuff I forgot during lockdown, this is one thing I never got.   
   >   
   > H is amp-turns/meter, and having distance in the denominator suggests that   
   > it is also a measure of flux density (but without the core influences).   
   > So why is B defined as flux density, as if that distinguishes it from H?   
   >   
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