29_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

29_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

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Alternating Current Circuits and Electromagnetic Waves 229 21.62 (a) The required frequency is 8 10 2 3.00 10 m s 1.0 10 Hz 3.00 10 m c f λ × == = × × . Therefore, the resonance frequency of the circuit is 10 0 1 1.0 10 Hz 2 f LC π × , giving () ( ) 13 12 6.3 10 F 4 0 0 1 0 H = × ×× 22 10 0 11 0.63 pF 2 21 0 H z C fL = (b) 2 0 0 A dd A C , so ( ) 13 3 3 12 2 0 6.3 10 F 1.0 10 m 8.5 10 m 8.5 mm 8.85 10 C N m Cd −− = × = ∈× A (c) ( ) ( )( ) 10 12 0 2 2 1.0 10 Hz 400 10 H 25 CL f L ππ = × × = Ω XX 21.63 (a) max max E c B = , so 6 16 max max 8 0.20 10 V m 6.7 10 T 3.00 E B c × × (b) ( ) max max 0 61 6 17 2 7 2 0.20 10 V m 6.7
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