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768_Physics ProblemsTechnical Physics

768_Physics ProblemsTechnical Physics - 108 P27.3 Current...

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108 Current and Resistance P27.3 Q t Idt I e t t a f e j = = z 0 0 1 τ τ (a) Q I e I τ τ τ a f e j a f = = 0 1 0 1 0 632 . (b) Q I e I 10 1 0 999 95 0 10 0 τ τ τ a f e j b g = = . (c) Q I e I ∞ = = −∞ a f e j 0 0 1 τ τ P27.4 (a) Using k e r mv r e 2 2 2 = , we get: v k e mr e = = × 2 6 2 19 10 . m s . (b) The time for the electron to revolve around the proton once is: t r v = = × × = × 2 2 5 29 10 2 19 10 1 52 10 11 6 16 π π . . . m m s s e j e j . The total charge flow in this time is 1 60 10 19 . × C , so the current is I = × × = × = 1 60 10 1 05 10 1 05 19 16 3 . . . C 1.52 10 s A mA . P27.5 The period of revolution for the sphere is T = 2 π ω , and the average current represented by this revolving charge is I q T q = = ω π 2 . P27.6 q t t
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