73. A sort of projectile launcher" is shown in Fig. 20-65.
Chapter 20, Problem 73(choose chapter or problem)
73. A sort of projectile launcher" is shown in Fig. 20-65. A large current moves in a closed loop composed of fixed rails, a power supply, and a very light, almost frictionless bar touching the rails. A magnetic field is perpendicular to the plane of the circuit. If the bar has a length L = 22 cm, a mass of 1.5 g. and is placed in a Field of 1.7 T. what constant current flow is needed to accelerate the bar from rest to 28 m/s in a distance of 1.0 m? In what direction must the magnetic field point?
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