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911_Physics ProblemsTechnical Physics

# 911_Physics ProblemsTechnical Physics - Chapter 32 P32.47...

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Chapter 32 251 P32.47 1 2 1 2 2 2 C V LI a f L N M O Q P = F H G I K J max max so V L C I C b g a f max max . . . . = = × × = 20 0 10 0 500 10 0 100 20 0 3 6 H F A V P32.48 When the switch has been closed for a long time, battery, resistor, and coil carry constant current I R max = ε . When the switch is opened, current in battery and resistor drops to zero, but the coil carries this same current for a moment as oscillations begin in the LC loop. We interpret the problem to mean that the voltage amplitude of these oscillations is V , in 1 2 1 2 2 2 C V LI a f = max . FIG. P32.50 Then, L C V I C V R = = = × = a f a f e j a f a f a f 2 2 2 2 2 6 2 2 2 0 500 10 150 250 50 0 0 281 max . . . ε F V V H . P32.49 This radio is a radiotelephone on a ship, according to frequency assignments made by international treaties, laws, and decisions of the National Telecommunications and Information Administration. The resonance frequency is f LC 0 1 2 = π . Thus, C f L = = × × = 1 2 1 2 6 30 10 1 05 10 608 0 2 6 2 6 π π b g e j e j . .
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