How Does Distance Affect Electric Flux Through a Square?

[jordanjj]

Homework Statement

In the figure, a point charge -3.2μ C is a distance d/2 directly above the center of a square of side d = 0.34 cm . What is the magnitude of the electric flux through the square? (Hint: Think of the square as on face of a cube with edge d.)
(in N*m^2/C)

Homework Equations

The Attempt at a Solution

Ok so I am not asking specifically for the solution, but when the charge is located a specific distance from a finite plane such as this, how does the distance from the square(d/2) play into the solution?

 

[quantize]

Well since Flux = E dot dA, you need to find the Electric field going through the side of the square. So the distance from the square is r in the equation for an electric field due to a point charge ( E = kq/(r^2) ).