24. Electric Force & Field; Gauss' Law

Given a uniform electric field perpendicular to the plane of an annular ring (surface $3$) with inner radius $a$ and outer radius $b$, what is the electric flux $\Phi 3_{}$ through the ring if the electric field has magnitude $E$ and points outward from the surface?

Which of the following correctly describes the electric flux $\Phi$ through a flat surface of area $A$ placed perpendicular to a uniform electric field $E$?

A point charge of $q$ is placed at the center of a closed spherical surface. What is the electric flux through the surface?