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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующие вопросы: 1. Электрон, двигаясь со скоростью 4 Мм/с, влетает под углом 60 градусов к силовым линиям однородного магнитного поля с индукцией 1 мТл. Определить радиус и шаг винтовой линии, по которой будет двигаться электрон в магнитном поле. 2. Катушка из 100 витков площадью 15 см2 вращается в однородном магнитном поле с частотой 5 оборотов в секунду. Ось вращения перпендикулярна оси катушки и силовым линиям поля. Определить индукцию магнитного поля, если максимальное значение ЭДС индукции, возникающей в катушке, равно 0,25 В.
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05.05.2011, 17:05
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это ответ
Здравствуйте, Дмитрий! Задача №2. Данная задача идет в аналогии с задачей которая размещена здесь: https://rfpro.ru/question/179846 Дано: А = 90° (угол) N = 100 S = 0.0015 м2 n = 5 Гц = 5 с-1 E(max) = 0,25 В Найти: B - ? Решение: Рассмотрим один виток рамки. при равномерном вращении вокруг оси ОО` с угловой скоростью w магнитный поток через его площадь будет меняться по закону Ф=ВS cosA - (1), где S - площадь рамки; А - угол между нормалью к плоскости и вектором B. Считая что при t=0 A=0, имеем А= wt индуцируемая в витке ЭДС индукции Е(индукции)=lim(по t-->0) [-dФ/dt] - (2). Поскольку Ф(t) = BS cosA = BS w sin(wt) - (3). Индуцируемая в N витках ЭДС будет в N раз больше: E = NE(индукции) = NBSw sin wt = E(max) sin(wt), (где E(max) - максимальное значение (амплитуда) ЭДС индукции: E(max) = NBSw - (4). Следовательно, при равномерном вращении рамки в однородном магнитном поле в ней возникает переменная синусоидальная переменная ЭДС самоиндукции. Подставляя в (4) значение угловой скорости w = 2Пn, где n частота вращения рамки, получим E(max) = 2П n NBS, и отсюда можно выразить индукцию магнитного поля: B = E(max) / 2П n NS = 0.05 (Тл) Ответ: В = 0,05 Тл
Дано: N = 100, n = 5 Гц, S = 15 см2 = 15 • 10-4 м2, B = 0,2 Тл. Определить: Emax.
Вкратце решение задачи, по-моему, таково. Удобно (но необязательно) положить для определенности, что в начальный момент времени ось катушки параллельна линиям магнитной индукции. Тогда поток через катушку и потокосцепление будут зависеть от угла поворота оси катушки относительно линий магнитной индукции. Угол φ поворота оси катушки относительно линий индукции поля может быть найден из соотношения φ = ωt = 2πnt. Тогда магнитный поток Ф через катушку как функция времени определяется по формуле Ф = BS • cos 2πnt, потокосцепление Ψ = NФ = NBS • cos 2πnt, а ЭДС E = -dΨ/dt = 2πnNBS • sin 2πnt. Максимальное значение ЭДС Emax = 2πnNBS (при sin 2πnt = 1).
Здесь также необходимо выразить индукцию магнитного поля из последней формулы.
Направление этой силы перпендикулярно вектору индукции поля и перпендикулярно составляющей скорости , которая также нормальна к вектору индукции:
vx=v*sina
Сила Лоренца создает центростремительное ускорение и будет изменять лишь направление вектора скорости, не влияя на его модуль. Поэтому составляющая движения электрона в результате действия силы Лоренца есть движение по окружности в плоскости, перпендикулярной вектору индукции, с центростремительным ускорением
a=F/m=e*v*sina*B/m (1)
Учитывая связь касательной скорости и центростремительного ускорения, получаем радиус этой окружности (радиус винтовой линии): a=vx2/R=(v*sina)2/R (2)
Вторая проекция скорости будет направлена паралелльно вектору индукции и перпендикулярно силе Лоренца, поэтому эта составляющая скорости не изменяется во времени:
vy=v*cosa
Учитывая период вращения по окружности
T=2*pi/w=2*pi*R/vx=2*pi*m/(e*B), получаем смещение электрона в направлении за время одного оборота, т.е. шаг спирали: h=vy*T=v*cosa*2*pi*m/(e*B) подставим численные значения: h=4*106 м/с*cos60*2*3.14*9.11*10-31 Кг/(1.6*10-19Кл*10-3 Тл)=71.51*10-3 м
Ответ:R=19.72*10-3м, h=71.51*10-3 м
Перепроверьте пожалуйста расчеты и подстановку численных значений. Если будут какие-нибудь вопросы, обращайтесь в мини-форум.
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