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Electric Fields on a Circular Disk

A circular disk has a charge density 0f G C/m^2 and a radius of R m.

A test charge, P, is located Z m above the center of the disk on a line perpendicular to the disk and passing through the center of the disk.

Using polar coordinates (d(area) = r*dr*d(theta)) find the value of the electric field ,E, at P.

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PDF and Word document attached show how to use polar coordinate to find the value of an electric field.