Dear Tutors,

Please help me study by answering this practice problem. Include steps.

Problem 4. (15 points) A disk of radius R produces a potential of 0.0844 Volts at the center of the disk at point P, as shown. Assume that the charge density o on the disk varies linearly with the radius r according to o = Ar, where A = 9.55 x 10"C/m'. Find the value of the radius R of the disk in centimeters. P R