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Homework Help: Simple Vector Notation

  1. Jul 25, 2011 #1
    1. The problem statement, all variables and given/known data

    Does
    [tex]r_{12}[/tex]
    mean distance from point 1 to point 2, or point 2 to point 1?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 25, 2011 #2
    Where you typically see this notation is the vector form of Coulomb's law where electric force exerted by a charge q1 on a second charge q2 is written F12
     
  4. Jul 25, 2011 #3
    Cheers, I'm using in it Biot-Savat law so same thing really. I always forget it, it drives me nuts! Thanks again.
     
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