From: titang78@gmail.com   
      
   In "Relativistic length contraction and magnetic force" I have explained   
   the mechanism of creation of magnetic force from Coulomb force and   
   relativistic length contraction. For facilitating the understanding of   
   this mechanism I used parallel current elements because the lengths are   
   contracted in the direction of the currents. But real currents are   
   rarely parallel, for example, dIa and dIb of the two circuits in Figure   
   1. For correctly applying length contraction on currents in any   
   direction, we will consider conductor wires in their volume and apply   
   length contraction on volume elements of the wires.  Please read the   
   article at   
      
   PDF Length-contraction-magnetic-force between arbitrary currents   
      
   http://pengkuanem.blogspot.com/2017/05/length-contraction-magnetic-force.html   
      
   or Word   
      
   https://www.academia.edu/32815401/Length-contraction-magnetic-fo   
   ce_between_arbitrary_currents   
      
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