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**1. Homework Statement**

At each point on the surface of the cube shown in the figure, the electric field is parallel to the z axis. The length of each edge of the cube is 3.7 m. On the top face of the cube = -40 N/C, and on the bottom face of the cube = +10 N/C. Determine the net charge contained within the cube.

**2. Homework Equations**

flux = E x A

flux = charge enclosed/ permittivity constant (epsilon-naught)

**3. The Attempt at a Solution**

I first plugged the numbers to find the flux of the the ends of the cube, then the plugged that into the second equation to find the charge enclose, but I got a really small number that wasn't right.