805_Physics ProblemsTechnical Physics

805_Physics ProblemsTechnical Physics - Chapter 28 *P28.38...

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Chapter 28 145 *P28.38 (a) We model the person’s body and street shoes as shown. For the discharge to reach 100 V, qt Qe C Vt C Ve tRC af === −− ∆∆ 0 V V e 0 = V V e 0 = + t RC V V = F H G I K J ln 0 150 pF 80 pF 5 000 M 3 000 V FIG. P28.38(a) tR C V V = F H G I K J × F H G I K J = ln ln . 0 61 2 5 000 10 230 10 3000 100 391 F s ej (b) t × = 1 10 230 10 30 782 2 VA CV s ln µ P28.39 (a) τ == × × = RC 4 00 10 3 00 10 12 0 66 .. . s e j (b) I R ee t × ε 12 0 400 10 6 12 0 . . . s qC e e qe I e t tt =− = µµ 1 3 00 10 12 0 1 36 0 1 3 00 2 0 12 0 12 0 . a f C A FIG. P28.39 P28.40 V Q C 0 = Then, if () = Vt V e = 0 bg and V e 0 = . When V = 1 2 0 , then e = 1 2 −= F H G I K J t RC ln ln 1 2 2. Thus, R t C = ln 2 . Section 28.5 Electrical Meters
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