Question: (a) A point charge Q lies at the origin. Show that div D is zero everywhere except at the origin. (b) Replace the point charge

(a) A point charge Q lies at the origin. Show that div D is zero everywhere except at the origin.

(b) Replace the point charge with a uniform volume charge density ρ_v0 for 0 < r < a. Relate ρv0 to Q and a so that the total charge is the same. Find div D everywhere.

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