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Find the Electric Field

  1. Sep 18, 2011 #1
    I have an exam on Monday in my E&M class. I've been doing the homework, etc etc. My prof. even has a link on his website that has old exams that we can use to study from. The exam Im practicing off of has the questions, a (sketchy) calculation, and an answer. This question has been driving me and my classmates NUTS! Nobody can solve it! I can't make sense of his calculations, can somebody please tell me Im not crazy…or, better yet…show me what Im not seeing. Thanks.

    ScreenShot2011-09-17at114319PM.png

    That weird looking thing at the top that looks like R**(2.3) is supposed to be the radius to the power of 2.3. Yeah, I don't get it either, but thats what my prof. told me.

    The answer is in parenthesis.

    Is there something wrong with the calculations?

    Why can't I figure this out??
     
  2. jcsd
  3. Sep 18, 2011 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    Rewriting this, in case you don't understand it: you have a spherical volume filled with distributed static charge. It's not uniformly distributed, it gets more dense the farther you move away from the centre. The charge density in the sphere is a function of distance from the centre=(5.5*10-15)*r2.3

    I've forgotten how to solve these. :redface: I guess it's going to involve an integral.
     
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