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How do I know when to use the charge density or not in a Gauss problem?

  1. Sep 27, 2012 #1
    I feel that I'm always struggling with these kinds of problems since I never know if the information is to be considered a density or not. Is there any trick/key words I should be on the look-out to determine whether they gave me a density charge or a point charge?
  2. jcsd
  3. Sep 27, 2012 #2


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    2017 Award

    Staff: Mentor

    Look at the units.
    Coulomb -> point charge
    Coulomb per volume (or area, or length) -> charge density per volume (or area, or length)
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