Lag1989 problem number 17.45

600 turns of thin wire are evenly wound on an iron ring in one layer. The average diameter of the ring is 300 mm, its cross-sectional area is 6.00 cm². At what current strength I in the winding, the magnetic flux Ф through the cross section of the ring will be equal to 840 μWb. When solving the problem, use the curve shown in the figure.