(23-41) Suppose the flat circular disk of Fig. 23-15 (Example 23-9) has a nonuniform surface charge

(23-41) Suppose the flat circular disk of Fig. 23-15 (Example 23-9) has a nonuniform surface charge density σ=ar^2, where r is measured from the center of the disk. Find the potential V(x) at points along the x axis, relative to V=0 at x=∞.