A crude model for the Uranium nucleus is a spherical ball of radius 7.40 x 10^-15 m with a charge of +92e uniformly distributed over its volume (e = 1.60 x 10^-19 Coulombs). Find the electric field produced by this charge distribution at r = 3.00 x 10^-15 m, r = 6.00 x 10^-15 m, and r = 9.00 x 10^-15 m.