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Homework Help: Please help me! Electric Field question!

  1. Sep 30, 2004 #1
    I posted my query in this forum i got no replies maybe no one cared to look because the name wasn't catchy enough ... but here is the link to the thread

    https://www.physicsforums.com/showthread.php?t=45347
     
  2. jcsd
  3. Sep 30, 2004 #2
    for x >> a , use binomial expansion.
     
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