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A plastic rod has been bent into a circle of radius R = 8.80 cm. It has a
charge Q1 = +4.60 pC uniformly distributed along one-quarter of its circumference and a
charge Q2 = -6Q1 uniformly distributed along the rest of the circumference. Take V = 0 at

(a) What is the electric potential at the center C of the circle?


(b) What is the electric potential at point P, which is on the central axis of the circle at

distance D = 6.71 cm from the center?


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