Задача id12502

A rigid conducting frame of square shape lies on a horizontal non-conducting surface and is in a constant uniform magnetic field, the induction lines of which are parallel to the two sides of the frame. The mass of the frame is m = 20 g, the length of its side is a = 4 cm, the magnitude of the magnetic induction is B = 0.5 Tesla. What magnitude of direct current must be passed through the frame for the frame to begin to rise?

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