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Консультация № 199115
02.09.2020, 00:33
0.00 руб.
22.09.2020, 06:36
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Элементарнаякруглая рамка диаметром 6 см на частоте 300 МГц возбуждается током, амплитуда которого 1 А. Определить амплитуды напряженности электрического и магнитного полей в точке наблюдения, находящейся на расстоянии 30 м от рамки под углом 2π/5 рад. к ее оси. Показать рисунок.
Элементарнаякруглая рамка диаметром 6 см на частоте 300 МГц возбуждается током, амплитуда которого 1 А. Определить амплитуды напряженности электрического и магнитного полей в точке наблюдения, находящейся на расстоянии 30 м от рамки под углом 2π/5 рад. к ее оси. Показать рисунок.
Обсуждение
09.09.2020, 17:49
общий
это ответ
Здравствуйте, dar777!
Амплитуды напряжённости электрического и магнитного полей на расстоянии r от элементарной рамки площадью S, возбуждаемой током с амплитудой I[sub]0[/sub], равны
где [$955$] - длина волны, [$952$] - угол между осью рамки и направлением на точку наблюдения, w = 120[$960$] Ом - волновое сопротивление среды. С учётом того, что длина волны связана с частотой соотношением [$955$] = c/f (c [$8776$] 3[$183$]10[sup]8[/sup] м/с - скорость света), а площадь круглой рамки диаметром d равна S = [$960$]d[sup]2[/sup]/4, имеем
В данном случае d = 6 см = 0.06 м, f = 300 МГц = 3[$183$]10[sup]8[/sup] Гц, I[sub]0[/sub] = 1 А, r = 30 м, [$952$] = 2[$960$]/5 и
В/м = 106 мВ/м,
А/м = 282 мкА/м.
Амплитуды напряжённости электрического и магнитного полей на расстоянии r от элементарной рамки площадью S, возбуждаемой током с амплитудой I[sub]0[/sub], равны
где [$955$] - длина волны, [$952$] - угол между осью рамки и направлением на точку наблюдения, w = 120[$960$] Ом - волновое сопротивление среды. С учётом того, что длина волны связана с частотой соотношением [$955$] = c/f (c [$8776$] 3[$183$]10[sup]8[/sup] м/с - скорость света), а площадь круглой рамки диаметром d равна S = [$960$]d[sup]2[/sup]/4, имеем
В данном случае d = 6 см = 0.06 м, f = 300 МГц = 3[$183$]10[sup]8[/sup] Гц, I[sub]0[/sub] = 1 А, r = 30 м, [$952$] = 2[$960$]/5 и
В/м = 106 мВ/м, А/м = 282 мкА/м.
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