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893_Physics ProblemsTechnical Physics

# 893_Physics ProblemsTechnical Physics - Chapter 31 = 0.900...

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Chapter 31 233 P31.57 (a) ε = = B v A 0 360 . V I R = = ε 0 900 . A (b) F I B B = = A 0 108 . N (c) Since the magnetic flux B A is in effect decreasing, the induced current flow through R is from b to a . Point b is at higher potential. FIG. P31.57 (d) No . Magnetic flux will increase through a loop to the left of ab . Here counterclockwise current will flow to produce upward magnetic field. The current in R is still from b to a . P31.58 ε = B v A at a distance r from wire ε µ π = F H G I K J 0 2 I r v A v FIG. P31.58 P31.59 (a) At time t , the flux through the loop is Φ B BA a bt r a bt r = = + °= + cos cos θ π π a f e j a f 2 2 0 . At t = 0 , Φ B ar = π 2 . (b) ε π π = − = − + = d dt r d a bt dt br B Φ 2 2 a f (c) I R br R
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