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 a on its surface. (Figure 1) Figure <1 of 1 > Part C Find the direction of the electric field E. Consider points above the annulus in the figure. O+x-direction Ox-direction Submit ▾ Part D Request Answer 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 z=0.01R₁ and released. Find the frequency of oscillation of the particle. Express your answer in terms of the variables R₁, R₂, a, m, q, and constant k.

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 a on its surface. (Figure 1) Figure <1 of 1 > Part C Find the direction of the electric field E. Consider points above the annulus in the figure. O+x-direction Ox-direction Submit ▾ Part D Request Answer 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 z=0.01R₁ and released. Find the frequency of oscillation of the particle. Express your answer in terms of the variables R₁, R₂, a, m, q, and constant k.