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Within a spherical charge distribution of charge density ρ(r),N equipotential surfaces of potential V0,V0+V,V0+2V,..........V0+NV(V>0), are drawn and have increasing radii r_0, r_1, r_2,..........r_N, respectively. If the difference in the radii of the surfaces is constant for all values of V_0 and ∆V then :

\begin{array}{1 1}(1) ρ (r) \propto r \\ (2) ρ (r) = constant \\ (3) \rho (r) \propto \frac{1}{r} \\ (4) \rho (r) \propto \frac{1}{r^2} \end{array}

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