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Jackson 3.7 Three point charges (q,−2q,q) are located in ...

  1. Aug 20, 2016 #1
    1. The problem statement, all variables and given/known data
    Hi,
    The question is
    "
    Three point charges (q,−2q,q) are located in a straight line with separation a and with the middle charge (−2q) at the origin of a grounded conducting spherical shell of radius b ..."

    I have found a solution for this problem but there is one step that I don't understand. I have uploaded the pdf file.
    Last page the term ##-\frac{1}{r}## vanishes and at the bottom of the page the
    ##\frac{1}{b}-\frac{1}{r}## vanishes too. Can you tell me why?
     

    Attached Files:

  2. jcsd
  3. Aug 20, 2016 #2
    at l=0 the term vanishes.
    But what about the other values of l
     
    Last edited: Aug 20, 2016
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