The circular disk of radius a shown in Figure has uniform charge density ps across its sur...

The circular disk of radius a shown in Figure has uniform charge density ps across its surface.

(a) Obtain an expression for the electric potential V at a point P = (0, 0, z) on the z-axis.

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(b) Use your result to find E and then evaluate it for z = h. Compare your final expression with (4.24), which was obtained on the basis of Coulomb’s law.