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Консультация № 194655
10.02.2019, 13:16
0.00 руб.
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1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
1. При падении электромагнитной волны на диэлектрический экран амплитуда Em электрической составляющей отраженной волны составляет эта=1/3 от амплитуды падающей. Найти диэлектрическую проницаемость эпсилон экрана, если магнитная проницаемость мю=1.
Очень срочно нужно.
1. При падении электромагнитной волны на диэлектрический экран амплитуда Em электрической составляющей отраженной волны составляет эта=1/3 от амплитуды падающей. Найти диэлектрическую проницаемость эпсилон экрана, если магнитная проницаемость мю=1.
Очень срочно нужно.
Обсуждение
20.02.2019, 12:08
общий
это ответ
Здравствуйте, dar777!
Коэффициент отражения электромагнитной волны по амплитуде на границе двух сред определяется выражением
где
- волновое сопротивление среды с диэлектрической проницаемостью [$949$][sub]i[/sub] и магнитной проницаемостью [$956$][sub]i[/sub]. С учётом этого можно записать
В данном случае для первой среды (воздуха или вакуума) можно считать [$949$][sub]1[/sub] = [$956$][sub]1[/sub] = 1, для второй среды (диэлектрического экрана) [$956$][sub]2[/sub] = 1 и [$951$] = 1/3. Подставляя известные значения, получаем
откуда
и диэлектрическая проницаемость экрана равна
Коэффициент отражения электромагнитной волны по амплитуде на границе двух сред определяется выражением
где
- волновое сопротивление среды с диэлектрической проницаемостью [$949$][sub]i[/sub] и магнитной проницаемостью [$956$][sub]i[/sub]. С учётом этого можно записать
В данном случае для первой среды (воздуха или вакуума) можно считать [$949$][sub]1[/sub] = [$956$][sub]1[/sub] = 1, для второй среды (диэлектрического экрана) [$956$][sub]2[/sub] = 1 и [$951$] = 1/3. Подставляя известные значения, получаем
откуда
и диэлектрическая проницаемость экрана равна
5
Это самый лучший ответ!
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