1. The problem statement, all variables and given/known data Well, I'm trying to take advance in my course and learn about how to calculate flux integrals. I have a few problems I can try out but I can't seem to understand the method they are using to solve the problems. 2. Relevant equations I don't know.. All I have is int(surface) v x dA 3. The attempt at a solution For example, I tried doing one of the problems. The question asks me to find the flux of the vectorial field through the surface. F = yj through the square of sides 4 in the plane y=5. The square is centered on the y axis, its sides are parallel to the axis' and is oriented in the positive y direction. Now I was trying to figure out some sort of method of how to solve problems like these. This is what I did. I replaced y=5 in the equation F=yj and then multiplied it by the orientation which gave me F = 5. In this case, my dA was jdxdy. From there, I had a double integral such as int(0,4) int(0,4) F x dA. int(0,4) int(0,4) 5dxdz = 80 That does give me the correct answer but I want to know if the way I got to it is correct. If its not, are there any equations or other information that I should know about. None are given in the book :(. Thanks!