321 Example 53.1: (Find the flux of the vector field 𝐅 , , )=〈1,2,3〉through the square S in the xy- plane with vertices (0,0), (1,0), (0,1) and (1,1), where positive flow is defined to be in the positive z direction. (Since the surface S lies in the xy-plane, it is identical to R in this case). Solution: Since positive flow is in the direction of positive z, and the surface S is on the ...