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Консультация № 168029
22.05.2009, 21:36
0.00 руб.
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Уважаемые эксперты! помогите ,пожалуйста, решить задачи.....а то я совсем не могу с ними справиться...(((
1)Параксиальный электронный пучок, прошедший разность потенциалов U=900 B, вводится в длинный соленоид с однородным магнитным полем. Соленоид имеет n=10^3 витков на метр длины. Каковы должны быть магнитная индукция В и ток I в обмотке соленоида, чтобы электроны, вводимые под небольшими углами к оси, вновь возвращались на ось на расстоянии l=0.2 м от места введения их в магнитное поле? Уд. заряд электрона e/m=1.76*10^11 Кл/кг
2)Индукция магнитного поля, пронизывающего проволочный контур с площадью 1 см^2 и сопротивлением R=10 ом , изменяется со временем по закону B=Bо - kt, где k=0.1 Тл/с. Вектор индукции поля перпендикулярен плоскости контура. Какой заряд q протечет по проволоке контура за t=1 мин?
3)Ток идет от медного кольца радиусом r1=5 мм к соосному с ним медному кольцу радиусом r2=5 см по плоской алюминиевой фольге толщиной b=0.2 мм. Какое количество тепла выделится в фольге за 1 сек, если ток равен I=6 А? Удельное сопротивление алюминия p=0.028*10^(-6) Ом*м
Заранее огромное спасибо! :)
1)Параксиальный электронный пучок, прошедший разность потенциалов U=900 B, вводится в длинный соленоид с однородным магнитным полем. Соленоид имеет n=10^3 витков на метр длины. Каковы должны быть магнитная индукция В и ток I в обмотке соленоида, чтобы электроны, вводимые под небольшими углами к оси, вновь возвращались на ось на расстоянии l=0.2 м от места введения их в магнитное поле? Уд. заряд электрона e/m=1.76*10^11 Кл/кг
2)Индукция магнитного поля, пронизывающего проволочный контур с площадью 1 см^2 и сопротивлением R=10 ом , изменяется со временем по закону B=Bо - kt, где k=0.1 Тл/с. Вектор индукции поля перпендикулярен плоскости контура. Какой заряд q протечет по проволоке контура за t=1 мин?
3)Ток идет от медного кольца радиусом r1=5 мм к соосному с ним медному кольцу радиусом r2=5 см по плоской алюминиевой фольге толщиной b=0.2 мм. Какое количество тепла выделится в фольге за 1 сек, если ток равен I=6 А? Удельное сопротивление алюминия p=0.028*10^(-6) Ом*м
Заранее огромное спасибо! :)
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