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The charge density on a disk of radius R = 12.2 cm is given by a=ar, with a = 1.34 μC/m3 and r measured radially outward
from the origin (see figure below). What is the electric potential at point A, a distance of 36.0 cm above the disk? Hint: You will
need to integrate the nonuniform charge density to find the electric potential. You will find a table of integrals helpful for
performing the integration.

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