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A little help with electric potential.

  1. Sep 9, 2004 #1
    Here is the problem:

    [​IMG]

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    The way we were taught in class so far to find the potential was using the integral of E dot dS. Which works itself down to (kq/r) evaluated from the r you are looking for to infinity.

    In which case, V would equal 2.15059 v. But this answer is incorrect according to my homework service.

    Any ideas?
     
  2. jcsd
  3. Sep 9, 2004 #2

    Tide

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    You should have three different expressions for the electric field for the three regions. Did you account for that in your integration to infinity?
     
  4. Sep 10, 2004 #3
    no, i dont think so. could you explain more?
     
  5. Sep 10, 2004 #4

    Tide

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    In the region [itex]1.4 < r < 4.2[/itex] the electric field is determind only by the charge on the inner sphere. In [itex]4.2 < r < 7[/itex] the electric field is determined by both the charge on the inner sphere AND the inner surface of the shell. And outside the configuration [itex]r > 7[/itex] the electric field is due to the charge on the inner sphere and both the inner and outer surfaces of the shell.
     
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