Question: A disk of radius R carries a charge density + 0 for r < a and an equal but opposite charge density 0 for a

A disk of radius R carries a charge density + σ0 for r < a and an equal but opposite charge density –σ0 for a < r < R. The total charge carried by the disk is zero.

(a) Find the potential a distance x along the axis of the disk.

(b) Obtain an approximate expression for V(x) when x >> R.

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