1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook