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Electric Field of a charged rod

  1. Apr 17, 2009 #1
    1. The problem statement, all variables and given/known data

    The figure below is a section of a conducting rod of radius R1 = 1.30 mm and length L = 11.00 m inside a thick-walled coaxial conducting cylindrical shell of radius R2 = 10.0R1 and the (same) length L. The net charge on the rod is Q1 = +1.50 10-12C that on the shell is Q2 = −2.00Q1.
    Question: What is the magnitude E of the electric field at a radial distance of r = 1.50R2? and
    What is the magnitude E of the electric field at a radial distance of r = 4.50R1
    2. Relevant equations

    Electric Field = k(Q/(r (sq rt (r^2 + (L/2)^2)))
    (I believe thats the only relevant equation)

    3. The attempt at a solution

    8.99^9 (1.5e-12/(.000585 x sqrt(.000585^2 + (.0013/2)^2)) = 26359
     
    Last edited: Apr 17, 2009
  2. jcsd
  3. Apr 17, 2009 #2

    rl.bhat

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    Homework Helper

    Use Gauss' theorm to find the electric field.
     
  4. Apr 17, 2009 #3
    but all I know is the charge, how can I go from flux to electric field?
     
  5. Apr 17, 2009 #4

    rl.bhat

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    Flux per unit area is the electric field.
     
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