Electric flux through cube faces with point charge at center

[grandprix]

Homework Statement

A point charge of magnitude q is at the center of a cube with sides of length L.

Part A
What is the electric flux Phi through each of the six faces of the cube?
Part B
What would be the flux $$\phi$$through a face of the cube if its sides were of length L1?

Homework Equations

$$\phi$$=Ea cos theta

$$\phi$$ = q/E_o

The Attempt at a Solution

Not sure of where to begin. Can someone show me how to tackle this?

 

[ideasrule]

Use Gauss' law. Remember that since the charge is at the cube's center, and all of the cube's sides are identical, the flux through one side is one-sixth the flux through the whole thing.

 

[grandprix]

(1/6)$$\epsilon$$₀/q?

 

[ideasrule]

Close, but q is supposed to be on the top and epsilon at the bottom.