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Solid insultaing sphere electric field

  1. May 22, 2010 #1
    1. The problem statement, all variables and given/known data
    A solid insulating sphere of radius R carries a charge per unit volume of p. Use Gauss' law to find an expression for the eletric field on a spherical surface of radius R/2 ie: inside the sphere.


    2. Relevant equations
    Gauss' Law = (Net Flux = Q / Eo)

    Volume of a Sphere = (4/3)(pi)(R^3)


    3. The attempt at a solution
    I simply combined Gauss' Law and the volume of the sphere to get,

    E = (4Q) / [(3)(pi)(Eo)((R/2)^3)]

    That seems to easy though have I missed something?
     
  2. jcsd
  3. May 22, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Not sure what you did here. What's Q? Express the charge within the gaussian surface in terms of ρ. How do you calculate the flux?
     
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