A surface completely surrounds a +4.7 10-6 C charge. Find the electric flux through this surface when the surface is a sphere with a radius of 0.40 m, a sphere with a radius of 0.20 m, and a cube with edges that are 0.20 m long.
(a) a sphere with a radius of 0.40 m N · m2/C
(b) a sphere with a radius of 0.20 m N · m2/C
(c) a cube with edges that are 0.20 m long N · m2/C