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Консультация № 194929
10.03.2019, 18:31
0.00 руб.
13.03.2019, 02:56
0
5
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Определить проводимость и удельную тепловую мощность тока в проводнике с концентрацией электронов n=8[$183$]1028 м-3 и средней дрейфовой скоростью u=2,8[$183$]10-2 см/с, если разность потенциалов [$916$][$966$] двух точек однородного электрического поля в проводнике, отстоящих на l=2,2 мм друг от друга, составила 1,4[$183$]10-4 В.
Определить проводимость и удельную тепловую мощность тока в проводнике с концентрацией электронов n=8[$183$]1028 м-3 и средней дрейфовой скоростью u=2,8[$183$]10-2 см/с, если разность потенциалов [$916$][$966$] двух точек однородного электрического поля в проводнике, отстоящих на l=2,2 мм друг от друга, составила 1,4[$183$]10-4 В.
Обсуждение
10.03.2019, 18:32
общий
Обратите внимание на эту консультацию
Об авторе:
Лучшая увеличительная линза - ноги.
Лучшая увеличительная линза - ноги.
15.03.2019, 16:16
общий
это ответ
Здравствуйте, dar777!
Если ток проводимости в проводнике обеспечивается частицами с зарядом e и концентрацией n, то проводимость (удельная электропроводность) такого проводника будет определяться выражением:
где [$956$] - подвижность носителей заряда в электронных проводниках, определяемая как
где u - средняя дрейовая скорость движения заряженных частиц под действием электрического поля с напряжённостью E. Если электрическое поле создаёт разность потенциалов [$916$][$966$] на расстоянии l, то его напряжённость равна
и
откуда
Удельная тепловая мощность связана с проводимостью и напряжённостью поля соотношением
В данном случае n = 8[$183$]10[sup]28[/sup] м[sup]-3[/sup], e = 1.602[$183$]10[sup]-19[/sup] Кл - заряд, u = 0.028 см/с = 0.00028 м/с, [$916$][$966$] = 0.00014 В и l = 2.2 мм = 0.0022 м. Тогда
См/м
(что примерно соответствует проводимости меди) и
Вт/м3.
Если ток проводимости в проводнике обеспечивается частицами с зарядом e и концентрацией n, то проводимость (удельная электропроводность) такого проводника будет определяться выражением:
где [$956$] - подвижность носителей заряда в электронных проводниках, определяемая как
где u - средняя дрейовая скорость движения заряженных частиц под действием электрического поля с напряжённостью E. Если электрическое поле создаёт разность потенциалов [$916$][$966$] на расстоянии l, то его напряжённость равна
и
откуда
Удельная тепловая мощность связана с проводимостью и напряжённостью поля соотношением
В данном случае n = 8[$183$]10[sup]28[/sup] м[sup]-3[/sup], e = 1.602[$183$]10[sup]-19[/sup] Кл - заряд, u = 0.028 см/с = 0.00028 м/с, [$916$][$966$] = 0.00014 В и l = 2.2 мм = 0.0022 м. Тогда
См/м(что примерно соответствует проводимости меди) и
Вт/м3.
5
Это самое лучшее решение!
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