Question: A uniformly charged disk has radius R and surface charge density as in the figure. The electric potential V at a point P at

A uniformly charged disk has radius R and surface charge density as in the figure. The electric potential V at a point P at a distance d along the perpendicular central axis of the disk is

where k_e is a constant (called Coulomb’s constant). Show that

V = 2rk.o(/d + R d) Tk R'o for large d

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