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Homework Help: Electrostatic potential at a point outside a sphere

  1. Feb 11, 2013 #1
    A conducting spherical shell of radius 11.0 cm is charged to a potential of 5.00*10^4 V. What is the value of the electrostatic potential 5.0 cm outside the surface of the sphere?

    V=(1/[4*pi*(epsilon naught)])*(Q/r) <-- outside of the shell
    V=(1/[4*pi*(epsilon naught)])*(3Q/2R) <-- inside the shell

    I tried to figure out Q knowing the electrostatic potential and radius of the shell by plugging those numbers into the second equation. I then took the calculated charge and plugged it into the first equation for a point outside of the shell to determine V, but my answer is wrong. I'm not sure what I need to do.
  2. jcsd
  3. Feb 11, 2013 #2
    Nevermind, I found the solution.
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