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?