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Help.Mayday.about electricity and magnetism

  1. Jan 31, 2010 #1
  2. jcsd
  3. Jan 31, 2010 #2
    I cannot answer the questions correctly.I try all my best.Firstly, the teacher said this is not a infinite line charge in the 1st question,instead it is a point charge.So, the Gauss's law is not appropriate. I use the Coulomb's law.But...I skill don't know how to do it.
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