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3) Two long parallel guide wires of zero resistance, separated by a distance d-1m are connected to a potential difference ΔV = 3V. A bar of mass m=12g and resis- tance R = 3Ω makes contact with these wires, and can slide along them without friction, always remaining perpendicular to the wires. An externally applied uni- form magnetic field B-5T is perpendicular to the plane of the bar and the two wires. Find the velocity of the bar right after 2 seconds, assuming that the bar has an initial velocity of 1.2 m/s at time t0.
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