Two long parallel guide wires of zero resistance, separated by a distance d=1m, are connected to a potential difference ∆v = 3v. a bar of mass m=5kg and resistance r = 3ω makes contact with these wires, and can slide along them without friction, always remaining perpendicular to the wires. an externally applied uniform 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 t=0.
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