7_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

7_Chapter 20 HomeworkCH20 Induced Voltages and Inductance -...

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Induced Voltages and Inductance 181 20.10 () cos B BA tt θ ε ∆Φ == ∆∆ ( ) 2 2 0.15 T 0.12 m 0 cos0 3.4 10 V 34 mV 0.20 s π  −°  × = 20.11 The magnitude of the induced emf is ( ) cos B ∆Φ If the normal to the plane of the loop is considered to point in the original direction of the magnetic field, then 0 and 180 if = ° . Thus, we find () () 2 2 0.20 T cos 0.30 m 9.4 10 V 94 mV 180 0.30 T cos0 1.5 s °− ° × = 20.12 ( ) cos B NBA ∆Φ , so cos t B NA ⋅∆ = or ( )( ) [] 3 5 2 0.166 V 2.77 10 s 5.20 10 T 52.0 T 500 0.150 m 4 cos0 cos90 B µ × × ° = 20.13 The required induced emf is ( )( ) 0.10 A 8.0 0.80 V IR = =Ω = . From cos B B NA ∆Φ  
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This document was uploaded on 10/20/2011.

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