903_Physics ProblemsTechnical Physics

903_Physics ProblemsTechnical Physics - Chapter 32 P32.12...

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Chapter 32 243 P32.12 L N I NBA I NA I NI R NA R B ==≈ ⋅= Φ µ π 00 2 22 FIG. P32.12 P32.13 εε == 0 eL dI dt kt dI L ed t kt =− ε 0 If we require I 0 as t →∞ , the solution is I kL e dq dt kt 0 QI d t kL t kL kt = zz 0 0 0 2 Q = 0 2 . Section 32.2 RL Circuits P32.14 I R e Rt L 1 ej : 0900 1 300 250 . .. RR e R s H af exp . . . . ln . . F H G I K J = R R 0100 10 0 1 92 s H H 3.00 s P32.15 (a) At time t , It e R t = τ 1 where L R 0200 . s . After a long time, I e max = = −∞ 1 . At I = 0500 . max 1 . . a f R e R t = s 1 0.5 0 0 0.2 0.4 0.6 t (s) I (A) I max FIG. P32.15 so 0500 1 . . e t s . Isolating the constants on the right, ln ln . . e t = s and solving for t , −=
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