A thin disk with a circular hole at its center, called an annulus, has inner radius R1 and outer radius R2. The disk has a uniform positive surface charge density σ on its surface. A point particle with mass m and negative charge −q is free to move along the x-axis (but cannot move off the axis). The particle is originally placed at rest at x=0.01R1 and released. Find the frequency of oscillation of the particle. Express your answer in terms of the variables R1, R2, σ, m, q, and constant k.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.