Question: A disk with a hole has inner radius R in and outer radius R out . The disk is uniformly charged with total charge Q.

A disk with a hole has inner radius R_in and outer radius R_out.
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. Verify that your expression has the correct behavior when R_in → 0.

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