877_Physics ProblemsTechnical Physics

877_Physics ProblemsTechnical Physics - Chapter 31 P31.7 =...

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Chapter 31 217 P31.7 ε µ = = = × d BA dt nA dI dt a f 0 500 0 480 10 0 3 . . V (a) I R ring A = = × × = ε 4 80 10 3 00 10 1 60 4 4 . . . (b) B I r ring ring T = = µ µ 0 2 20 1 . (c) Coil’s field points downward, and is increasing, so B ring points upward . FIG. P31.7 P31.8 ε µ µ π = = = d BA dt nA dI dt n r I t a f 0 500 0 500 0 0 2 2 . . (a) I R n r R I t ring = = ε µ π 0 2 2 2 (b) B I r n r r R I t = = µ µ π 0 1 0 2 2 2 1 2 4 (c) The coil’s field points downward, and is increasing, so B ring points upward . FIG. P31.8 P31.9 (a) d d I x Ldx B Φ = = B A µ π 0 2 : Φ B h h w IL dx x IL h w h = = + F H G I K J + z µ π µ π 0 0 2 2 ln (b) ε µ π µ π = − = − + F H G I K J L N M O Q P = − + F H G I K J L N M O Q P d dt d dt IL h w h L h w h dI dt B Φ 0 0 2 2 ln ln ε π π µ = − × + F H G I K J = 4 10 1 00 2 1 00 10 0 1 00 10 0 4 80 7 T m A m
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