16_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

16_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

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190 CHAPTER 20 20.40 From ( ) LIt ε =∆∆ , the self-inductance is 3 3 24.0 10 V 2.40 10 H 10.0 A s L It × == = × ∆∆ Then, from B LN I , the magnetic flux through each turn is ( )( ) 3 52 10 H 4.00 A 1.92 10 T m 500 B × Φ= = × 2.40 LI N = 20.41 The inductive time constant is LR τ = . From ( ) = ∆∆ , the self-inductance is L = with units of VV s As A  s = ⋅=Ω   . Thus, the units of the time constant are s s Ω⋅ = . 20.42 (a) The time constant of the RL circuit is = , and that of the RC circuit is RC = . If the two time constants have the same value, then
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