\begin{problem*}{24.21}
-Figure P24.21 represents the top view of a cubic gaussian surface in a
+Figure~P24.21 represents the top view of a cubic gaussian surface in a
uniform electric field \vect{E} oriented parallel to the top and
bottom faces of the cube. The field makes an angle $\theta$ with side
$a$, and the area of each face is $A$. In sumbolic form, find the