An imaginary cubical surface of side l has its edges parallel to the x-, y- and z-axes, one corner at the point x = 0, y = 0, z = 0 and the opposite corner at the point x=l, y=l, z=l. the cube is in a region of uniform electric field e⃗ =e1i^+e2j^, where e1 and e2 are positive constants. calculate the electric flux through the cube face in the plane x = 0 and the cube face in the plane x=l. for each face the normal points out of the cube.