Gauss's law, cylinder

Discussion in 'Homework Help' started by ihatereg, Feb 13, 2010.

  1. ihatereg

    Thread Starter New Member

    Mar 10, 2009
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    http://img404.imageshack.us/img404/4148/gauss3j.png (infinitly long)

    [latex]\Phi=\Phi_{0}(1-{r \over R}) {C \over m^2}[/latex]

    What's the charge of the cylinder of length L?


    I have done some calculations, but they were all wrong (checked by teacher).
     
  2. nubelube

    New Member

    Jan 3, 2010
    16
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    1. What problem are you try to solve (and what are your assumptions? e.g. charge density)? What do your symbols denote (e.g. what are C and m)?
    2. What did you do in your attempt to solve it? (and why, if it's not obvious)
     
  3. lmartinez

    Active Member

    Mar 8, 2009
    224
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    Are you attempting to find the electric field at a given distance due to a uniform line charge of an infinite length whose charge per unit length is given? ...
     
  4. ihatereg

    Thread Starter New Member

    Mar 10, 2009
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    C over m are units. It should be m^3 actually.

    Anyway, question I gave you is additional one. The more important one is what is the electric field when r<R?
     
  5. ihatereg

    Thread Starter New Member

    Mar 10, 2009
    9
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    C over m are units. It should be m^3 actually.

    Anyway, question I gave you is additional one. The more important one is what is the electric field when r<R?
     
  6. mik3

    Senior Member

    Feb 4, 2008
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    When r is less than R the electric field is zero.
     
  7. ihatereg

    Thread Starter New Member

    Mar 10, 2009
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  8. mik3

    Senior Member

    Feb 4, 2008
    4,846
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    You can assume an area inside the cylinder and calculate the net electric flux throught it.
     
  9. lmartinez

    Active Member

    Mar 8, 2009
    224
    6
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