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Question: there was another answer but i did not quite get...

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Problem 3: Consider a disk of radius R in the xy-plane with a non-uniform surface charge density ơ(r)-ar, where a > 0 is a constant. Determine the electric field at a point z above the disk, along its axis of symmetry

there was another answer, but i did not quite get it. it seemed to use polar coordinates or something, but i don't really understand how it set up the integral.

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