A thin, circular disk of radius 30.0 cm is oriented in the yz-plane with its center at the origin. The disk carries a total charge of +3.00 μC distributed uniformly over its surface. Calculate the magnitude of the electric field due to the disk at the point x=15.0 cm along the x-axis. (ϵ0=8.85×10−12 C 2 /N · m 2 )