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Physics Question about flux

  1. Feb 24, 2008 #1
    1. The problem statement, all variables and given/known data
    I have a new question if anyone could help....

    The question states:
    Find an expression for the electric flux passing through the surface of the Gaussian sphere as a function of r for r < a. (Use epsilon_0 for 0, rho for , Q, a, and r as necessary.)

    Find an expression for the electric flux for r > a. (Use epsilon_0 for 0, p for , Q, a, and r as necessary.)

    a, being the radius of the sphere and r being the given radius that is either <a, or >a
     
  2. jcsd
  3. Feb 24, 2008 #2

    Doc Al

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    Staff: Mentor

    Present the problem exactly as given. Don't leave anything out.
     
  4. Feb 24, 2008 #3
    sorry, here is the full problem....

    An insulating solid sphere of radius a has a uniform volume charge density and carries a total positive charge Q. A spherical Gaussian surface of radius r, which shares a common center with the insulating sphere, is inflated starting from r = 0.

    (a) Find an expression for the electric flux passing through the surface of the Gaussian sphere as a function of r for r < a. (Use epsilon_0 for 0, rho for , Q, a, and r as necessary.)

    (b) Find an expression for the electric flux for r > a. (Use epsilon_0 for 0, p for , Q, a, and r as necessary.)
     
  5. Feb 25, 2008 #4

    Doc Al

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    Staff: Mentor

    Apply Gauss's law. What you'll need to do is find the total charge contained within the Gaussian surface as a function of r. That's just charge density times volume. (Figure out the charge density from the given information.)
     
  6. Feb 25, 2008 #5
    thanks. i did that and it worked out!
     
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