A conductive rod with a length of l = 10 cm and a resistance of R = 1 Ohm can slide along horizontally arranged parallel buses, which are connected to a direct current source with E = 10 V and an internal resistance r = 1 Ohm. A weightless spring with a stiffness coefficient k = 0.1 N / m, located in the horizontal plane, is attached to the middle of the rod. A uniform magnetic field with induction B = 10 ^ -2 T acts perpendicular to the plane of the conductors. By neglecting the resistance of the tires and wires, determine the deformation energy of the spring.
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