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Find the electrical field of a Spherical Shell

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Consider a thin spherical shell of radius 14.0 cm with a
    total charge of 32.0 %C distributed uniformly on its
    surface. Find the electric field (a) 10.0 cm and (b) 20.0 cm
    from the center of the charge distribution.

    2. Relevant equations

    img34.gif

    3. The attempt at a solution

    Stumped...

    I figured that the E(r) was the electrical field of the sphere.

    I did 9.9E9(32E-9/14^2) (also did it in meters too)

    I guess I am just completely lost in this one.
     

    Attached Files:

  2. jcsd
  3. Oct 12, 2009 #2

    rl.bhat

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    Homework Helper

    Electric field due to a charged sphere at a distance r is given by
    E = (1/4πεo)*Q/r^2
    In side the charged sphere, the electric field is .....?
     
  4. Oct 12, 2009 #3
    I got it.

    10cm < 14cm, so its inside, meaning = 0

    20cm > 14cm, so ke(q/r^2) = 8.99E9(32E-9/.2^2) = 7192, so now I just have to look over where I messed up on the order of magnitude

    7.192 MN/C from the center... is the answer!
     
  5. Oct 12, 2009 #4

    rl.bhat

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    Homework Helper

    In the problem, the charge is given as 32%C. What is that? micro or nano?
    If it is micro, the answer will be correct. You will get 7.192*10^6N/C or 7.192MN/C.
     
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