A disk of radius R = 4.0 cm is sprayed with a charged paint so that the radial charge density (the charge per area in a ring of radius r) varies continually with radial distance r from the center in the following manner: σ = −(5.0 C/m²)r R Find the potential (in GV), with respect to zero potential at infinity, at a point 3 cm above the center. × GV Additional Materials Reading
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