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An electron is constrained to the central axis of a washer - a disk with a...

An electron is constrained to the central axis of a washer - a disk with a hole in the middle - of charge density ? = 1c/m2. The radius of the hole is 1.3m and the radius of the washer at the outside edge is 2.2m. The electrostatic force exerted on the electron can cause the electron to oscillate through the center of the washer. Find the frequency of small oscillation of the electron in Hertz.

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