electrical charges, Physics

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An electron is constrained to the central perpendicular axis of a ring of charge of radius 2.2 m and charge 0.015 mC. See Section 22-6. Suppose the electron is released from rest a distance 0.044 m from the ring center. It then oscillates through the ring center. Calculate its period in seconds. (The electron is always much closer to the ring center than a radius.) See picture: https://farm4.staticflickr.com/3719/10018729693_f46fbeabfe_o.jpg

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