Лаг1989 задача №17.50

The steel toroid, whose cross-sectional area is S = 4 cm2, has 10 turns for each centimeter of length. The currents I = 2 A flow through the turns. Under these conditions, the magnetic permeability of steel 20. Find the magnetic flux Φ through the cross section of the toroid. The magnetic field in the cross section of the toroid is assumed to be homogeneous.

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