24. Electric Force & Field; Gauss' Law

The electric flux through each surface of a cube is given below. Which surfaces of the cube does the electric field run parallel to? 

Φ₁ = 100 Nm² /C Φ₂ = 20 Nm² /C

Φ₃ = 0 Nm² /C Φ₄ = 0 Nm² /C

Φ₅ = −40 Nm² /C Φ₆ = −80 Nm² /C

Where does the normal vector point for a spherical shell?

What is the total flux through the two surfaces depicted in the following figure? Note that surface 1 has an area of 50 cm² and surface 2 has an area of 100 cm² , and E = 500 N/C.