Equation 23-11 (E = /0) gives the electric field at points near a charged conducting surface. Apply this equation to a conducting sphere of radius

Equation 23-11 (E = σ/ε0) gives the electric field at points near a charged conducting surface. Apply this equation to a conducting sphere of radius r and charge q, and show that the electric field outside the sphere is the same as the field of a point charge located at the center of the sphere.