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A disk with a hole has inner radius rin and outer radius rout. the disk is uniformly charged with total charge q. find an expression for the on-axis electric potential at distance z from the center of the disk

User Juan Tomas
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Here it is.  I used the surface charge density σ as q/Area, and then wrote it out in terms of q at the end
A disk with a hole has inner radius rin and outer radius rout. the disk is uniformly-example-1
User Charlie Lin
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