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Finding the E field with a changing p?

  1. Feb 7, 2012 #1
    Finding the E field with a changing p???

    Given that ρ=ρ0r/R when finding the charge enclosed would you use

    1:Qencl = ∫(ρ*dV)

    or

    2: Qencl = ρV given that ρ has already been given with a coefficient to account for a changing r?
     
  2. jcsd
  3. Feb 7, 2012 #2
    Re: Finding the E field with a changing p???

    If you mean that little 'r' is a variable radius then you must integrate (option 1), because the charge density is a function of the radius.

    Integrate over a volume if the problem is 3dimensional, or over an area if the problem is 2d.
     
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