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8_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

# 8_Chapter 20 HomeworkCH20 Induced Voltages and Inductance -...

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182 CHAPTER 20 (b) When the current is zero, the flux through the loop is 0 B Φ = and the average induced emf has been 72 8 1.88 10 T m 0 6.28 10 V 3.00 s B t ε ∆Φ ×⋅ == 20.15 If the solenoid has current I , the magnetic field inside it is () 74 0 300 41 0 T m A 6 . 0 01 0 T A 0.200 m Bn I I µπ π −−  ==× = ×   I (a) 2 42 62 cos 6.00 10 T A 5.0 A 2.0 A 1.5 10 m cos0 4.0 10 T m B BA θ ππ  ×  ∆Φ = ° (b) ( ) 5 4 4.0 10 T m 1 . 81 0 V 0.90 s B N t ∆Φ = × = 18 V µ 20.16 The magnitude of the average emf is ( ) ( ) cos 200 1.1 T 100 10 m cos180 44 V 0.10 s B NBA N tt ∆Φ ∆∆ ×° ° Therefore, the average induced current is
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