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Homework Help: Electric potential

  1. Jan 19, 2007 #1
    1. The problem statement, all variables and given/known data
    A charge q sits in a spherical hollow inside a spherical conductor.

    q is located at r=0
    Hollow from r = 0 to r =a
    from r=a to r=b a conductor
    r=b to r = infinity free space

    Find the potential everywhere
    2. The attempt at a solution
    I calculated these
    [tex] E = \frac{1}{4 \pi \epsilon_{0}} \frac{q}{r^2} \hat{r} [/tex]
    for r<a and r> b

    E= 0 for a<r<b


    To find the potential from 0 to r=a is what concerns me... We end up having hte potential blow up in at the origin.

    it is late and im not thinking striaght but i cant see a way out ....

    please help!
     
  2. jcsd
  3. Jan 19, 2007 #2
    Your answer is correnct.... Good job....

    That is absolutely normal for a point charge, That is the reason why we have to
    DEFINE V = 0 at r = infinity instead of r = 0
     
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