A disk of radius 3.00 cm has a uniformly distributed charge of Q = 5.20 uC.
a. Calculate the electric field (using the more general theory) on the perpendicular axis of disk at a point a distance of 3.0 mm from the center.
Now calculate the electric field using the near-field approximation, \(E = \sigma / 2\epsilon_{0}\) What is the percent error?