877_Physics ProblemsTechnical Physics

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

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Chapter 31 217 P31.7 εµ == = × dBA dt nA dI dt af 0 500 0 480 10 0 3 .. V (a) I R ring A × × = ε 480 10 300 10 160 4 4 . . . (b) B I r ring ring T µ 0 2 20 1 . (c) Coil’s field points downward, and is increasing, so B ring points upward . FIG. P31.7 P31.8 π = dt nA dI dt nr I t a f 0500 00 2 2 (a) I R R I t ring µπ 02 2 2 (b) B I r rR I t 0 1 0 2 2 2 1 24 (c) The coil’s field points downward, and is increasing, so B ring points upward . FIG. P31.8 P31.9 (a) dd I x Ldx B Φ=⋅ = BA 0 2 : Φ B h hw IL dx x IL h + F H G I K J + z 22 ln (b) =− + 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 L h dI dt B Φ ln ln ×⋅ + F H G I K J 41 0 1 0 0 2 100 100 100 10 0 4 80 7 TmA m As V ej bg . ln . The long wire produces magnetic flux into the page through the rectangle,
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