860_Physics ProblemsTechnical Physics

860_Physics ProblemsTechnical Physics - 200 P30.36 Sources...

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200 Sources of the Magnetic Field P30.36 (a) Φ B BA =⋅ = BA where A is the cross-sectional area of the solenoid. Φ B NI r = F H G I K J = µ πµ 0 2 740 A ej . W b (b) Φ B BA NI rr =⋅ = = F H G I K J π 0 2 2 1 2 A Φ B = ×⋅ L N M M O Q P P −= 41 0 3 0 0 1 2 0 0300 8 00 4 00 10 2 27 7 22 3 2 TmA A m m W b a fa f af . . .. . Section 30.6 Gauss’s Law in Magnetism No problems in this section Section 30.7 Displacement Current and the General Form of Ampère’s Law P30.37 (a) d dt dQ dt I E Φ = = = 00 12 9 0100 885 10 11 3 10 . . . A CNm Vms (b) I d dt I d E =∈ = = 0 Φ . A P30.38 d dt d dt EA dQ dt I E Φ == = (a) dE dt I A = 0 11 719 10 V m s (b) Bd s d dt E ⋅= z Φ so 2 0 2 rB d dt Q A r =∈ L N M O Q P B Ir A × 0 0 2 2 7 2 0200 500 10 20 1 0 0 200 10 . . a f T Section 30.8 Magnetism in Matter P30.39 (a) I ev r = 2 F H
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