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Консультация № 144806
23.09.2008, 21:24
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2
1
Два параллельных провода, погруженных в глицерин, индуктивно соединены с генератором электромагнитных колебаний частотой _7; = 420МГц. Расстояние l между пучностями стоячих волн на проводах равно 7 см. Найти диэлектрическую проницаемость ^9; глицерина. Магнитную проницаемость µ принять равной единице
Обсуждение
23.09.2008, 23:30
общий
это ответ
Здравствуйте, Петров П.П.!
Расстояние l между пучностями стоячих волн на проводах равно половине длины λламбдаг волны в глицерине, т.е λламбдаг = 2*l (1). С другой стороны λламбдаг = cг/нюν (2), где cг - скорость распространения электромагнитных волн в глицерине, νню - частота. Из классической электродинамики: cг = cвак/√(εэпсилонг*µмюг) (3), где cвак - скорость распространения электромагнитных волн в вакууме, откуда εэпсилонг = (cвак/cг)2/µмюг (4), а после подстановки (1) и (2): εэпсилонг = (cвак/(2*l*ν)2/µмюг = (3*108/(2*0.07*420*106)2/1 =26.
Расстояние l между пучностями стоячих волн на проводах равно половине длины λламбдаг волны в глицерине, т.е λламбдаг = 2*l (1). С другой стороны λламбдаг = cг/нюν (2), где cг - скорость распространения электромагнитных волн в глицерине, νню - частота. Из классической электродинамики: cг = cвак/√(εэпсилонг*µмюг) (3), где cвак - скорость распространения электромагнитных волн в вакууме, откуда εэпсилонг = (cвак/cг)2/µмюг (4), а после подстановки (1) и (2): εэпсилонг = (cвак/(2*l*ν)2/µмюг = (3*108/(2*0.07*420*106)2/1 =26.
24.09.2008, 09:57
общий
Повидимому, греческие буквы не читаются в той кодировке, которой Вы пользуетесь. Добавляю русское написание. Как сделать, чтобы, греческие буквы и прочие знаки читались - обратитесь в техподдержку, или задайте вопрос в соотв. рассылку. Эксперт по рассылке "Физика" не обязан это знать. Кстати, в ответе на вопрос № 144538 греческие буквы кроме λламбда были скопированы из Вашего же вопроса. А читаются ли показатели степени и нижние индексы?
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