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Solve the all parts of given question:

Question: An insulating sphere of radius R has a total charge q and a charge density that is proportional to the square of the radial distance from its center.

Part A: Use gauss' law to find the electric field everywhere?

Part B: Determine the electric potential at the center of the sphere?

Part C: Make a graph for e vs. r and v vs. r, where e =electric field and v=electric potential?

I need help to determine the electric potential at the center of the sphere.

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