4_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

4_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

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204 CHAPTER 21 38. (a) 18 turns (b) 3.6 W 40. (a) Fewer turns (b) 25 mA (c) 20 turns 42. (a) 29.0 kW (b) 0.580% (c) The maximum power that can be input to the line at 4.50 kV is far less than 5.00 MW, and it is all lost in the transmission line. 44. 8 2.998 10 m s × 46. 80% 48. 26 3.74 10 W × 50. 11.0 m 52. Radio listeners hear the news 8.4 ms before the studio audience because radio waves
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