A uniformly charged disk has radius R and surface charge density as in the figure. The

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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 isV = 2rk.o(/d² + R² – d)

where ke is a constant (called Coulomb’s constant). Show thatTk R'o for large d

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