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Electric Potential outside of a spherical conductor

  1. Jan 30, 2012 #1
    1. The problem statement, all variables and given/known data

    The potential outside of a spherical conductor is given by V = keQ/r. Using Er = -dV/dr, derive the electric field outside this charge distribution.



    3. The attempt at a solution

    I attempted to take the negative derivative of V being -1/(r2) and then multiplying it by Ke and Q as they're both constant. But alas it says it is wrong so I am stuck. Help?
     
  2. jcsd
  3. Jan 30, 2012 #2
    I think you got the sign wrong. The two negatives cancel each other
     
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