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Need help with gauss law and charged ring AP Physics FRQ

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  1. Mar 17, 2013 #1
    1. The problem statement, all variables and given/known data
    1. a14d1y.jpg
    2. 2hmox8x.jpg

    2. Relevant equations
    ∫E.dA = Qenc/[itex]\epsilon[/itex][itex]_{o}[/itex]
    [itex]\lambda[/itex]=Q/L
    [itex]\rho[/itex]=Q/V
    V= q/4πε[itex]_{o}[/itex]r

    3. The attempt at a solution

    these types of problems i suck at, i dont know how to do these at all independently, and is there any difference in question 2 if there is an insulator or not? is that irrelevant?

    I have the scoring guidelines with the answers but they dont really teach anything
     
  2. jcsd
  3. Mar 17, 2013 #2

    rude man

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    This is a simple exercise in applying Gauss's theorem.

    To answer your question, yes it matters if the inside sphere is an insulator or a conductor. It matters for r < R.
     
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