Use the charge distribution and electric field calculated in Problem 22.57. (a) Show that for r R

Question:

Use the charge and electric field calculated in Problem 22.57. (a) Show that for r ≥ R the potential is identical to that produced by a point charge Q. (Take the potential to be zero at infinity.)
(b) Obtain an expression for the electric potential valid in the region r ≤ R. Distribution
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