Review. The bar of mass m in Figure P31.83 is pulled
Chapter 31, Problem 83(choose chapter or problem)
Review. The bar of mass m in Figure P31.83 is pulled horizontally across parallel, frictionless rails by a massless string that passes over a light, frictionless pulley and is attached to a suspended object of mass M. The uniform upward magnetic field has a magnitude B, and the distance between the rails is ,. The only significant electrical resistance is the load resistor R shown connecting the rails at one end. Assuming the suspended object is released with the bar at rest at t 5 0, derive an expression that gives the bars horizontal speed as a function of time.
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