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59. Two stiff parallel wires a distance d apart in a horizontal plane act as rails to support a light metal rod of mass m (perpendicular to each rail), Fig. 27-49. A magnetic field B, directed vertically upward (outward in diagram), acts throughout. At t = 0, a constant current 7 begins to flow through the system. Determine the speed of the rod, which starts from rest at t = 0, as a function of time (a) assuming no friction between the rod and the rails, and (b) if the coef- ficient of friction is uk- (c) In which direction does the rod move, east or west, if the current through it heads north? North West d East

59. Two stiff parallel wires a distance d apart in a horizontal plane act as rails to support a light metal rod of mass m (perpendicular to each rail), Fig. 27-49. A magnetic field B, directed vertically upward (outward in diagram), acts throughout. At t = 0, a constant current 7 begins to flow through the system. Determine the speed of the rod, which starts from rest at t = 0, as a function of time (a) assuming no friction between the rod and the rails, and (b) if the coef- ficient of friction is uk- (c) In which direction does the rod move, east or west, if the current through it heads north? North West d East

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59. Two stiff parallel wires a distance d apart in a horizontal plane act as rails to support a light metal rod of mass m (perpendicular to each rail), Fig. 27-49. A magnetic field B. directed vertically upward (outward in diagram), acts throughout. At t= 0, a constant current I begins to flow through the system. Determine the speed of the rod, which starts from rest at t = 0, as a function of time (a) assuming no friction between the rod and the rails, and (b) if the coef- ficient of friction is uk- (c) In which direction does the rod move, east or west, if the current through it heads north? North West d East South FIGURE 27-49 Looking down on a rod sliding on rails. Problems 59 and 60. 0 이 Oo OO
Transcribed Image Text:59. Two stiff parallel wires a distance d apart in a horizontal plane act as rails to support a light metal rod of mass m (perpendicular to each rail), Fig. 27-49. A magnetic field B. directed vertically upward (outward in diagram), acts throughout. At t= 0, a constant current I begins to flow through the system. Determine the speed of the rod, which starts from rest at t = 0, as a function of time (a) assuming no friction between the rod and the rails, and (b) if the coef- ficient of friction is uk- (c) In which direction does the rod move, east or west, if the current through it heads north? North West d East South FIGURE 27-49 Looking down on a rod sliding on rails. Problems 59 and 60. 0 이 Oo OO
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