87. A sort of "projectile launcher" is shown in Fig. 20–71. A large current moves in a closed loop composed of fixed rails, a power supply, and a very light, almost frictionless bar (pale green) touching the rails. A magnetic field is perpendicular to the plane of the circuit. If the bar has a length { = 28 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? FIGURE 20–71 Problem 87.

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87. A sort of "projectile launcher" is shown in Fig. 20–71.
A large current moves in a closed loop composed of fixed
rails, a power supply, and a very light, almost frictionless
bar (pale green) touching the rails. A magnetic field is
perpendicular to the plane of the circuit. If the bar has a
length { = 28 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?
FIGURE 20–71
Problem 87.
Transcribed Image Text:87. A sort of "projectile launcher" is shown in Fig. 20–71. A large current moves in a closed loop composed of fixed rails, a power supply, and a very light, almost frictionless bar (pale green) touching the rails. A magnetic field is perpendicular to the plane of the circuit. If the bar has a length { = 28 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? FIGURE 20–71 Problem 87.
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