Task id9681
A horizontally located conductive rod, whose resistance is R and mass m, can slide without breaking electrical contact along two vertical copper bars. The distance between the tires is l. From below, their ends are connected to a current source, the emf of which is equal to E (Fig.). A uniform magnetic field with induction B is applied perpendicular to the plane in which the tires are located. Find the constant speed with which the rod will rise. The resistance of the tires and the current source, as well as friction, are neglected.
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