From: titang78@gmail.com   
      
   The relativistic length contraction effect and changing distance effect   
   produce 2 different magnetic forces. Together they form complete   
   magnetic force.   
      
   I have derived 2 magnetic forces with Coulomb’s law and charges’   
   velocity. The first force dFlc is derived in «Length-contraction   
   magnetic-force between arbitrary currents». The second force dFcd is   
   derived in «Changing distance effect». dFlc and dFcd are added together   
   to give the expression for complete magnetic force dFcm.   
      
   Please read the article at Coulomb magnetic force   
      
   PDF http://pengkuanem.blogspot.com/2018/03/coulomb-magnetic-force.html   
      
   or   
      
   Word https://www.academia.edu/36278169/Coulomb_magnetic_force   
      
   PDF Changing distance effect   
   http://pengkuanem.blogspot.com/2018/03/changing-distance-effect.html   
      
   or   
      
   Word https://www.academia.edu/36272940/Changing_distance_effect   
      
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