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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
-(5.0 C/m²)r
from the center in the following manner: σ =
R
Find the potential (in GV), with respect to zero potential at infinity, at a point 3 cm above the center.
+
× GV
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