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Homework Help: Electric fields

  1. Jan 16, 2009 #1
    I need help with the electric field of a line of charge, a ring, semicircle, a line of charge at a point that bisects the line of charge, and a uniform disc. The teacher showed us how to derive those equations but he does it so fast that I didn't have time to copy them down. Even if I did I won't understand why he made certain moves. So can someone please show me how to derive the equations for the electric field and how everything works? I also don't understand the role charge density plays. In each one it comes up.
     
  2. jcsd
  3. Jan 16, 2009 #2

    LowlyPion

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    Homework Helper

  4. Jan 16, 2009 #3
    Thanks. That will go on my favorites list. But it doesn't have a semi circle. Any ideas where I can find that?
     
  5. Jan 17, 2009 #4

    LowlyPion

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    I think the examples there should suggest ways to calculate it.
     
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