A cubical box has six faces, each 20 cm × 20 cm. The flux through each face is (the sides are labeled like a die, sides 1 and 6 are opposite to each other, as are 2 and 5, and 3 and 4.
Side Flux (Nm2/C)
1 -120
2 + 300
3 -100
4 + 600
5 -40
6 -150
Find the net charge inside the cube.