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Concentric Eletric Field Question

  1. Sep 15, 2011 #1
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution

    Hi! I have already write everything on the pictures(In attachment), I have already circled the correct answer, however, I am not sure explain it correctly. So, can you check my explanation or question?
    Thanks!

    7e2mO.png
     

    Attached Files:

  2. jcsd
  3. Sep 15, 2011 #2
    Draw an imaginary surface that contains both the thick conductor and the line of charge. What is the net charge per length inside that surface?
     
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