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Консультация № 191087
02.06.2017, 17:24
0.00 руб.
05.06.2017, 09:47
0
1
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
В медном проводнике, площадь сечения которого 1 мм2, течёт ток 10 А. Определить подвижность электронов, учитывая, что на каждый атом меди приходится два электрона проводимости.
В медном проводнике, площадь сечения которого 1 мм2, течёт ток 10 А. Определить подвижность электронов, учитывая, что на каждый атом меди приходится два электрона проводимости.
Обсуждение
05.06.2017, 09:49
общий
это ответ
Здравствуйте, Sasha!
Ом-1*м-1 - удельная проводимость меди;
м2 - площадь поперечного сечения проводника;
А - сила тока в проводнике;
- напряжённость электрического поля в проводнике, В/м;
- плотность тока в проводнике, А/м2; отсюда
- средняя скорость дрейфа электронов проводимости в проводнике, м/с;
моль-1 - число Авогадро;
кг/моль - молярная масса меди;
- концентрация электронов проводимости в проводнике, м-3;
Кл - заряд электрона;
кг/м3 - плотность меди.
Средняя скорость дрейфа электронов проводимости в проводнике связана с плотностью тока в проводнике соотношением
Если на каждый атом меди приходится два электрона проводимости, то концентрация электронов проводимости равна удвоенному количеству атомов меди в единице объёма, которое можно выразить через постоянную Авогадро, молярную массу меди и её плотность. Плотность - это масса единицы объёма вещества. В единице объёма меди содержится 
атомов, масса каждого из которых равна 
откуда 
Для подвижности
электронов проводимости в проводнике с учётом формул 
получим
(м2/(В*с)).
Проверьте расчёт во избежание ошибок.
Ом-1*м-1 - удельная проводимость меди; м2 - площадь поперечного сечения проводника; А - сила тока в проводнике; - напряжённость электрического поля в проводнике, В/м; - плотность тока в проводнике, А/м2; отсюда - средняя скорость дрейфа электронов проводимости в проводнике, м/с; моль-1 - число Авогадро; кг/моль - молярная масса меди; - концентрация электронов проводимости в проводнике, м-3; Кл - заряд электрона; кг/м3 - плотность меди.Средняя скорость дрейфа электронов проводимости в проводнике связана с плотностью тока в проводнике соотношением
Если на каждый атом меди приходится два электрона проводимости, то концентрация электронов проводимости равна удвоенному количеству атомов меди в единице объёма, которое можно выразить через постоянную Авогадро, молярную массу меди и её плотность. Плотность - это масса единицы объёма вещества. В единице объёма меди содержится атомов, масса каждого из которых равна откуда Для подвижности
электронов проводимости в проводнике с учётом формул получим (м2/(В*с)).Проверьте расчёт во избежание ошибок.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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