1. The problem statement, all variables and given/known data If the electric field is constant in direction (horizontal in the x direction) but its magnitude decreases from E1 to E2, determine the flux through a cubical box of side length L if four of the sides of the box are parallel to the field. 2. Relevant equations ∫EdA = flux 3. The attempt at a solution [itex] \int_0^L EdA = EA|_0^L = E_LA-E_0A = A(E_L-E_0) = L^2(E_L-E_0) [/itex] is this reasoning correct?