A conducting rod with length 0.0800 m slides without friction on conducting metal rails, as shown in the sketch. The apparatus is in a uniform magnetic field that has magnitude B = 0.600 T and that is directed out of the page. The resistance of the circuit is a constant R = 12.0 Ω. What is the magnitude of the external force required to move the bar at a constant speed of 5.00 m/s?
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