find the magnitude of the electric field
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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.
Determine the total electric charge on the annulus.
Express your answer in terms of the variables R1, R2, and σ.
The annulus lies in the yz-plane, with its center at the origin. For an arbitrary point on the x-axis (the axis of the annulus), find the magnitude of the electric field E⃗
Consider points above the annulus in the figure.
Express your answer in terms of the variables R1, R2, σ, x and constant k.
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