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Divergence theorem (determining the correct direction for normal vecto

  1. Jan 22, 2014 #1
    The problem is in the paint doc.. My question is why is the base vector aR have a negative sign attached to it?
     

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  2. jcsd
  3. Jan 22, 2014 #2
    In applying the divergence theorem, the normal vector is always outwardly directed from your system.
     
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