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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
21. Из микроамперметра с пределом измерения силы тока I0и со-противлением катушки R0 изготовляют амперметр с пределом изме-рения силы тока Iили вольтметр с пределом измерения напряжения Uпутем подключения шунта сопротивлением RШили добавочного сопротивления RД
Iо,мА--?? R0, кОм=0,5 I, А=0,3 U,в=10 RШ, 0м--?? RД, кОм=32.8
22. При подключении к батарее гальванических элементов резистора сила тока в цепи I1, напряжение на резисторе U1, мощность тока во внешней цепи Р1.При подключении к этой же батарее другого рези-стора сила тока в цепи I2, напряжение на резисторе U2, мощность тока Р2.Определите ЭДС и внутреннее сопротивление батареи, а также величину I2
I1, А=1 U1, В=11 Р1, Вт=11 U2, В=9 Р2, Вт=27
23. Рамка площадью S,содержащая Nвитков проволоки, вращается с частотой vв однородном магнитном поле с магнитной индукцией В. Максимальное значение ЭДС равно Е.Напишите формулу зависимости магнитного потока и ЭДС в рамке от времени, если в начальный момент времени ЭДС равна Е0. Определите величину S см^2
N=800 v, об/мин=120 В,мТл=200 E, x 10-1 В=12,6 E0, х 10-1В=10,9
24. Электрическая цепь, содержащая последовательно соединенные резистор сопротивлением R, катушку индуктивности Lи конденсатор емкостью C, подключена к источнику переменного тока частотой vи действующим напряжением U. Сила тока в цепи I, напряжения на резисторе, катушке, конденсаторе равны соответственно UR, UL, UC.Постройте векторную диаграмму. Вычислите сдвиг фаз между колебаниями силы тока и напряжения и мощность тока в ре¬зисторе. Найдите величины U,I,U(c индексом L)
Дано: N = 800, ν = 120 об/мин = 2 с-1, B = 200 мТл = 0,2 Тл, Эmax = E = 126 В, Э(t = 0 с) = E0 = 109 В. Определить: Ф(t), Э(t), S.
Решение.
Магнитный поток, проходящий через вращающуюся рамку, изменяется по гармоническому закону: Ф = BS • cos (2πνt + φ0), (1) где φ0 – угол между нормалью к плоскости рамки и направлением вектора B магнитной индукции в начальный момент времени (t = 0 с). В нашем случае φ0 = arccos (Э(t = 0 с)/Эmax) = arccos (E0/E) = arccos (109/126) ≈ 0,526 ≈ π/6 ≈ 30º. (2)
Величина электродвижущей силы Э индукции пропорциональна скорости изменения магнитного потока Ф, проходящего через контур, и в катушке с N витками в N раз больше, чем в одном витке: Э = -N • dФ/dt = -N • 2πν • BS • (-sin (2πνt + φ0)) = 2πνNBS • sin (2πνt + φ0), что с учётом исходных данных и найденного значения φ0 даёт следующее выражение для закона изменения электродвижущей силы в рамке: Э = 2πνNBS • sin (2πνt + φ0). (3)
Максимальное значение электродвижущая сила индукции принимает при sin (2πνt + φ0) = 1: Эmax = E = 2πνNBS, откуда получаем выражение для площади контура: S = Эmax/(2πνNB), (4) что после вычислений даёт S = 126/(2π • 2 • 800 • 0,2) ≈ 6,3 • 10-2 (м2).
Из выражений (1) – (4) получаем Ф = B • Эmax/(2πνNB) • cos (2πνt + φ0) = Эmax/(2πνN) • cos (2πνt + φ0) = = 126/(2π • 2 • 800) • cos (2π • 2 • t + π/6) ≈ 3,9π • 10-2 • cos (4πt + π/6), Вб; Э = 2πνNB • Эmax/(2πνNB) • sin (2πνt + φ0) = Эmax • sin (2πνt + φ0) = = 126 • sin (4πt + π/6), В.
Ответ: Ф = 3,9π • 10-2 • cos (4πt + π/6), Вб; Э = 126 • sin (4πt + π/6), В; S = 6,3 • 10-2 м2.
При решении задачи мы интерпретировали исходные данные таким образом: E x 10-1, В = 12,6, откуда E = 12,6/10-1 = 126 (В); E0 х 10-1, В = 10,9, откуда E0 = 10,9/10-1 = 109 (В).
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