Задача id9675

Horizontal rails are in a vertical uniform magnetic field at a distance l = 0.3 m from each other. There is a rod on the rails perpendicular to them. What should the magnetic field induction be in order for the rod to begin to move uniformly along the rails if a current of force I = 50 A is passed through it? The coefficient of friction of the rod on the rails is μ = 0.2, the mass of the rod is m = 0.5 kg.

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