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347. Круговой контур помещен в однородное магнитное поле так, что плоскость контура перпендикулярна магнитным силовым линиям. Напряженность магнитного поля - 1,6 • 105 А/м. По конту¬ру течет ток 2 А. Радиус контура - 2 см. Какую работу надо совер¬шить, чтобы повернуть контур на 90° вокруг оси, совпадающей с диаметром контура?
367. Радиус длинного парамагнитного сердечника соленоида -1 см. Соленоид содержит 10 витков на 1 см длины. Обмотка выпол¬нена из медного провода сечением 1 см2. Через какое время в об¬мотке соленоида выделится количество теплоты, равное энергии магнитного поля в сердечнике, если она подключена к источнику постоянного напряжения?
1. При произвольном перемещении замкнутого контура с током I = const в магнитном поле совершается работа A = I∆Ф, где ∆Ф – изменение магнитного потока сквозь поверхность, ограниченную замкнутым контуром.
Пусть в положении 1 контур расположен так, что ограниченная им поверхность перпендикулярна линиям индукции однородного магнитного поля, а в положении 2, занимаемом контуром после указанного в условии задачи поворота, параллельна им. Тогда магнитный поток сквозь поверхность, ограниченную этим контуром, в положении 2 равен Ф2 = 0, а в положении 1 равен Ф1 = BS = μ0HS = πμ0HR2.
Соответственно ∆Ф = Ф1 – Ф2, A = I(Ф1 – Ф2) = Iπμ0HR2. (1)
Подставляя в формулу (1) числовые значения I = 2 А, μ0 = 4π ∙ 10-7 Гн/м, H = 1,6 ∙ 105 А/м, R = 2 см = 0,02 м, находим A = 2 ∙ π ∙ 4π ∙ 10-7 ∙ 1,6 ∙ 105 ∙ 0,022 = 0,256 ∙0,02∙ π2 ∙ 10-2 ≈ 5,1*10-4 (Дж).
Ответ: 5,1*10-4 Дж.
2. Пусть соленоид таков, что его длина много больше диаметра сердечника. Выделим в соленоиде вдали от его краев элемент длины l = 1 см = 0,01 м, обмотка которого содержит n = 10 витков. Индуктивность такого элемента L = μμ0n2S/l = πμμ0n2r2/l, где S – площадь поперечного сечения, r – радиус сердечника; энергия магнитного поля в сердечнике при I = const W = LI2/2 = πμμ0n2r2I2/l. (1)
Предположим, что обмотка соленоида выполнена из проволоки круглого сечения. Тогда при площади поперечного сечения a = 1 см2 = 1 ∙ 10-4 м2 радиус сечения провода равен c = √(a/π) = √((1 ∙ 10-4/π) ≈ 0,564 ∙ 10-2 (м). Диаметр сечения провода составляет тогда d = 2c = 2 ∙ 0,564 ∙ 10-2 ≈ 1,13 ∙ 10-2 (м), и на длине l = 0,01 м десять витков уложены быть не могут. Поэтому ограничимся предположением о том, что обмотка выполнена плотно, т. е. витки проволоки уложены без зазоров, форма сечения проволоки неизвестна, а длина проволоки b приблизительно равна произведению числа витков на длину периметра поперечного сечения сердечника, т. е. b ≈ 2πrn. Сопротивление обмотки R = ρb/a; количество теплоты, выделившейся в обмотке, Q = I2Rt = I2tρb/a. (2)
По условию задачи Q = W. Тогда, приравнивая выражения (1) и (2), получаем I2tρb/a = πμμ0n2r2I2/l, tρb/a = πμμ0n2r2/l, откуда выводим t = πμμ0n2r2a/(lρb) = πμμ0n2r2a/(2πrnlρ) = μμ0nra/(2lρ). (3)
Подставим в формулу (3) числовые значения величин: μ > 1 (для парамагнетика), μ0 = 4π ∙ 10-7 Гн/м, n = 10, r = 0,01 м, a = 1 ∙ 10-4 м2, l = 0,1 м, ρ = 1,72 ∙ 10-8 Ом ∙ м и найдем t > 4π ∙ 10-7 ∙ 10 ∙ 0,01 ∙ 1 ∙ 10-4/(2 ∙ 0,1 ∙ 1,72 ∙ 10-8) ≈ 3,65 ∙ 10-3 (с). Поскольку материал парамагнетика в условии не указан, точное значение времени определить невозможно.
Ответ: t > 3,65 ∙ 10-3 с.
С уважением.
5
Об авторе:
Facta loquuntur.
Неизвестный
28.09.2009, 17:57
общий
во первых pi^2 ~= 10 pi^2*10^-2 ~= 0.1 0.256*0.1 = 0.0256 то есть запятую сдвинули не в ту сторону
а во вторых забыли радиус поднести в квадрат у меня получилось A= 5,1E-4 (Дж)
Приношу Вам свои извинения за допущенную ошибку в вычислении в первой задаче. Примите, пожалуйста, к сведению сообщение в мини-форуме вопроса от эксперта Baybak.
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