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Homework Help: Spherical Charge

  1. Sep 17, 2013 #1
    1. The problem statement, all variables and given/known data
    I have a question about notation. My professor posted an older practice test with some different notation techniques than I am used to.

    "Sphere Charge
    Find the electric field 2.5 m from the center of a region of space with a charge density given by ro=5.5 E-15 R**(2.3)"

    I understand most of it but am unsure what the R**(2.3) means.

    2. Relevant equations

    E = kQ/r^2
    ρ = 5.5 E-15

    3. The attempt at a solution

    I assume the R**(2.3) has something to do with the volume of the sphere but other than that I have nothing.

    Attached is a screenshot of the question.

    Attached Files:

  2. jcsd
  3. Sep 17, 2013 #2


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    Science Advisor
    Homework Helper

    '**' is Fortran talk for power. It's just ##R^{2.3}##. It's giving the charge density as a function of distance from the center of the sphere. You need to integrate that over the sphere to get total charge.
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