A sort of “projectile launcher” is shown in Fig. 20–65. A
Chapter 15, Problem 73GP(choose chapter or problem)
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 \(L=22 \mathrm{~cm}\), a mass of \(1.5 \mathrm{~g}\), and is placed in a field of \(1.7 \mathrm{~T}\), what constant current flow is needed to accelerate the bar from rest to \(28 \mathrm{~m} / \mathrm{s}\) in a distance of \(1.0 \mathrm{~m}\)? In what direction must the magnetic field point?
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