1 \begin{problem*}{20.22}
2 The electric potential insize a charged spherical conductor of radius
3 $R$ is given by $V_i = k_e Q / R$, and the outside potential is given
4 by $V_o = k_e Q/r$. Using $E_r = -dV/dx$, determine the electric
8 this charge distribution.
9 \end{problem*} % problem 20.22
14 E_i = - \frac{d}{dx}\left(\frac{k_e Q}{R}\right) = 0
16 Because $V_i$ is constant with respect to $r$.
20 E_o = - \frac{d}{dx}\left(\frac{k_e Q}{r}\right)
21 = -k_e Q \frac{d}{dx}\left(\frac{1}{r}\right)
22 = -k_e Q \frac{-1}{r^2}
23 = \ans{\frac{k_e Q}{r^2}}