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10. In each of the three cases (A, B. C), there is a total charge Q. In case A, that charge is spread out uniformly in a ring. In case B, it is a point charge. And in case C, it is spread out uniformly in a disk. Rank the magnitude of the electric field at point P (which is directly above the center) in the three cases. Explain your reasoning and make vector addition diagrams as needed. Z R R A B C