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Консультация № 175070
09.12.2009, 17:41
35.00 руб.
0
5
2
Доброго времени суток, уважаемые эксперты. Помогите решить две задачи по физике:
1. Внутреннее сопротивление аккумулятора 1 Ом. При силе тока 2 А его КПД равен 0,8.
Определить электродвижущую силу аккумулятора.
2. Под действием однородного магнитного поля перпендикулярно линиям индукции начинает перемещаться прямолинейный проводник массой 2 г, по которому течет ток 10 А. Чему равно изменение магнитного потока при движении проводника к моменту времени, когда скорость его станет равна 36,1 м/с?
Очень надеюсь на вас.
1. Внутреннее сопротивление аккумулятора 1 Ом. При силе тока 2 А его КПД равен 0,8.
Определить электродвижущую силу аккумулятора.
2. Под действием однородного магнитного поля перпендикулярно линиям индукции начинает перемещаться прямолинейный проводник массой 2 г, по которому течет ток 10 А. Чему равно изменение магнитного потока при движении проводника к моменту времени, когда скорость его станет равна 36,1 м/с?
Очень надеюсь на вас.
Обсуждение
Неизвестный
09.12.2009, 18:14
общий
это ответ
Здравствуйте, Robshnider.
КПД=Pполезн/Pполн
P=I2*R
КПД=I2*R/(I2*(R+r))=R/(R+r)
R - сопротивление внешней цепи; r - внутреннее сопротивление
R/(R+r)=0,8
0,2R=0,8r
R=4r
Тогда по закону Ома I=E/(R+r)
E=I*(R+r)=2A*(4+1)*1Ом = 10В
КПД=Pполезн/Pполн
P=I2*R
КПД=I2*R/(I2*(R+r))=R/(R+r)
R - сопротивление внешней цепи; r - внутреннее сопротивление
R/(R+r)=0,8
0,2R=0,8r
R=4r
Тогда по закону Ома I=E/(R+r)
E=I*(R+r)=2A*(4+1)*1Ом = 10В
Неизвестный
09.12.2009, 18:23
общий
это ответ
Здравствуйте, Robshnider.
1. Напряжение на клеммах аккуумулятора равно: Uкл=I*Rвн.
С другой стороны, Uкл=k*e (k - КПД, е - искомая э. д. с. аккумулятора). Получаем:
e=I*Rвн/к=2*1/0,8=2,5 В.
2. Работа перемещения проводника с током в магнитном поле:
A=I*dФ (dФ или "дельта" Ф - искомое изменение магнитного потока).
Кинетическая энергия проводника:
Eк=m*v^2/2.
Используя закон сохранения энергии, получаем:
I*dФ=m*v^2/2, откуда
dФ=m*v^2/(2*I)=(2*10^-3)*36,1^2/(2*10)=0,13 Вб. (1 вебер=кг*м^2/(c^2*А)).
1. Напряжение на клеммах аккуумулятора равно: Uкл=I*Rвн.
С другой стороны, Uкл=k*e (k - КПД, е - искомая э. д. с. аккумулятора). Получаем:
e=I*Rвн/к=2*1/0,8=2,5 В.
2. Работа перемещения проводника с током в магнитном поле:
A=I*dФ (dФ или "дельта" Ф - искомое изменение магнитного потока).
Кинетическая энергия проводника:
Eк=m*v^2/2.
Используя закон сохранения энергии, получаем:
I*dФ=m*v^2/2, откуда
dФ=m*v^2/(2*I)=(2*10^-3)*36,1^2/(2*10)=0,13 Вб. (1 вебер=кг*м^2/(c^2*А)).
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