A single-turn square loop of side L is centered on the axis of a long solenoid. In addition, the plane of the square loop is perpendicular to the axis of the solenoid. The solenoid has 1280 turns per meter and a diameter of 6.20 {rm cm}, and carries a current of 2.45 {rm A}. Find the magnetic flux through the loop when L = 2.10 {rm cm}. Find the magnetic flux through the loop when L = 6.20×10-2 {rm cm}.