Question

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. (Apply Faraday's Law, Ampere's Law, and Lenz's Law)

Answer 1