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{"ops":[{"insert":"A disk of radius\u00a0R\u00a0has positive charge uniformly distributed over an inner circular region of radius\u00a0a\u00a0and negative charge uniformly distributed over the outer annular (ring-shaped) region\u00a0(Figure 1).\u00a0The surface charge density on the inner region is\u00a0+\u03c3, and that on the annular region is\u00a0\u2212\u03c3. The electrostatic potential at\u00a0P, located on the central perpendicular axis a distance\u00a0z=R\u00a0from the disk center, is zero.\nWhat is\u00a0a?\n"},{"attributes":{"bold":true},"insert":"Express your answer in terms of\u00a0R. Express the coefficients using three significant digits."},{"insert":"\n\n"}]}
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