(Solution) - The circular disk of radius a shown in Fig 4 7 P4 28 has -(2025 Original AI-Free Solution)

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The circular disk of radius a shown in Fig. 4-7 (P4.28) has uniform charge density ?s across its surface.
(a) Obtain an expression for the electric potential V at a point P (0, 0, z) on the z-axis.
(b) Use your result to find E and then evaluate it for z = h. Compare your final expression with Eq. (4.24), which was obtained on the basis of Coulomb?s law.