Consider two charged metallic spheres S₁ and
S₂ of radii R₁ and R₂, respectively. The electric
fields E₁ (on S₁) and E₂ (on S₂) on their surfaces
are such that E₁/E₂ = R₁/R₂. Then the ratio
V₁ (on S₁) / V₂ (on S₂) of the electrostatic
potentials on each sphere is :