The charge density on a disk of radius R=12.0 cm is given by σ=ar, with a=1.40 µC/m3 and r measured radially outward from the origin as shown in the figure. What is the electric potential at point A, a distance of 40.0 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.
