23.7.1. Using Gauss' law, find the approximate magnitude of the electric field at the center of a circular face of a solid cylinder that has a length of 0.050-m, a radius of 0.020 m, and a uniform volume charge density p= 2.0 × 10-9 C/m³. a) 0.42 N/C b) 11 N/C c) 23 N/C d) 33 N/C e) 76 N/C