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Calculate the electric field E at P: (0, 0, 2) created by a disk carrying a uniform surface density of charge σ. The disk is in the x-y plane, centered at the origin. It has a circular hole in the middle, in which there is no charge. The disks inner radius is a, and its outer radius is b. Express your result in terms of the disks total charge q, and check that in the limit z b, E approximates the field of a point charge

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