889_Physics ProblemsTechnical Physics

889_Physics ProblemsTechnical Physics - Chapter 31 P31.47...

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Chapter 31 229 P31.47 (a) Doubling the number of turns. Amplitude doubles: period unchanged (b) Doubling the angular velocity. doubles the amplitude: cuts the period in half (c) Doubling the angular velocity while reducing the number of turns to one half the original value. Amplitude unchanged: cuts the period in half FIG. P31.47 P31.48 εθ π =− ° × F H G I K J = N t BA N r B t cos cos . .. . . af ej e j 2 3 01 0 0 0 5 0 0 1 150 500 20 0 10 0875 m T T s V 2 (a) I R == = ε 43 8 . . V 0.020 0 A (b) P = I 438 383 ... V A W a f P31.49 In the loop on the left, the induced emf is επ === = d dt A dB dt B Φ 0100 100 2 . m T s V bg and it attempts to produce a counterclockwise current in this loop. In the loop on the right, the induced emf is = d dt B Φ 0 150 100 2 25 2 m T s V FIG. P31.49
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