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Problem 9. (4 points) Fall of a rectangular loop. A conducting rectangular loop of mass M, resistance R, and dimensions a × b as shown in Fig. 8 is allowed to fall from rest through a uniform magnetic field which is perpendicular to the plane of the loop. The loop accelerates until it reaches a terminal speed(before the upper end enters the magnetic field). If a 2.0 m, B 6.0 T, R-130 and M= 0.60 kg, what is the terminal speed? (A) 1.6 m/s (B) 20 m/s (C) 2.2 m/s (D) 5.3 m/s 2 Figure 8. Fall of rectangular loop.

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The terminal speed is MgR (0.60) (9.80) (130)_53mts (6.0) (20)

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