- #1

annamal

- 381

- 33

The flux in equals -E*A1 where A1 is the area of the bottom of the trapezoid. The flux out equals E*A2 where A2 is the area of the top of the trapezoid. But the two fluxes aren't equal due to differing areas. We are only considering the bottoms of the trapezoid since the electric field only flows there as shown in the image.