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45 g horizontal metal bar, 11 cm long is free to slide up and down between...

45 g horizontal metal bar, 11 cm long is free to slide up and down between two tall, vertical metal rods 10 cm apart. The magnetic field, B, is directed perpendicular to the plane of the rods. The bar is raised to near the top of the rods and a 2.4 Ω resistor is connected across the two sides at the top. Then the bar is dropped. If the terminal velocity of the bar is 3000 m/s, what magnetic field (magnitude and direction) is required to produce this terminal velocity? Assume the bar remains horizontal and in contact with the rods.

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