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What is the Electric Field inside this charged sphere?

  1. Dec 4, 2016 #1
    1. The problem statement, all variables and given/known data
    Let me just put this here:
    http://i.imgur.com/dgcWAC3.png
    dgcWAC3.png
    .
    2. Relevant equations
    E_flux=EA=(q_encl)/(permittivity)
    Area=4pir^2

    3. The attempt at a solution
    Whenever I manipulate the above equations, I get a term of the form R/r, which implies, R being 5 cm, and r being the radius inside. This implies that the field goes to infinity at the center, when I'm pretty sure by spherical symmetry it is 0!
     
  2. jcsd
  3. Dec 4, 2016 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Not sure how you'd get an expression with R = 5 cm, when evaluating the field at r = 4 cm. Using Gauss' law at r = 4 cm gives you the field at that point, assuming spherical symmetry. What's the enclosed charge at that radius?

    That's true and Gauss' law agrees.
     
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