18_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

18_Chapter 20 HomeworkCH20 Induced Voltages and Inductance...

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192 CHAPTER 20 20.47 () 2 23 11 70.0 10 H 2.00 A 0.140 J 22 L PE LI == × = 20.48 (a) The inductance of a solenoid is given by 2 0 LN A µ = l , where N is the number of turns on the solenoid, A is its cross-sectional area, and is its length. For the given solenoid, l ( ) ( ) ( ) 2 2 7 2 0 3 4 10 T m A 300 5.00 1 m 4.44 10 H 0.200 m Nr L µπ π ×⋅ == = × l 0 −− × (b) When the solenoid described above carries a current of 0.500 A I = , the stored energy is 2 4.44 10 H 0.500 A 5.55 10 L PE LI × 4 J 20.49 The current in the circuit at time t is ( 1 t Ie R ) τ ε =− , and the energy stored in the inductor is 2 1 2 L LI = PE (a) As t , →∞ max 24 V 3.0 A 8.0 II R →= = = , and 2 2 max
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This document was uploaded on 10/20/2011.

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