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Electric field above a charged square loop

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  1. Feb 23, 2017 #1
    1. The problem statement, all variables and given/known data
    upload_2017-2-23_19-46-40.png

    2. Relevant equations


    3. The attempt at a solution
    I have the complete solutions for this problem, I just don't understand them:
    upload_2017-2-23_19-47-35.png
    This is the first part. I don't understand what r' is, or how we found it. Otherwise I understand the concept of the problem just not the details...
     
  2. jcsd
  3. Feb 23, 2017 #2
    r' is the position vector from selected origen to a charge element. 1487898499942.jpeg and to get the value of r' choose one point on the line and draw the vector to that point to see wich are its components in x and y direction.
     
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