Задача id10526

A square wire frame weighing 10 g with a side of 10 cm can rotate around a horizontal axis coinciding with one of its sides. The frame is in a uniform vertical magnetic field with an induction of 0.1 Tesla. At what minimum current strength in the frame will it be motionless and inclined to the horizon at an angle of 45°? g = 10 m/s2.

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