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Help finding direction of area vector on curved surfaces

  1. Dec 6, 2013 #1
    1. The problem statement, all variables and given/known data
    I understand how to determine the direction on rectangular surfaces, however when it comes to a cylinder or sphere or, in the case of the problem i am working on now, for a long rod that has been bent around in a circle i.e a a rectangular ring, I dont know what to do.
     
  2. jcsd
  3. Dec 6, 2013 #2
    The direction of the area vector is given by the normal to the surface. At the curved side of a circular cylinder, that is simply the radial direction.
     
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