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Консультация № 161421
25.02.2009, 23:13
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Помогите пожалуйста решить задачу очень надо к 27 числу=/
Найти силу, действующую на заряд q=(2/3*10вминусдевятой)Кл если он находится на расстоянии 2см от заряженной нити с линейной пл-тью заряда (2*10вминусдевятой) Кл/см
Найти силу, действующую на заряд q=(2/3*10вминусдевятой)Кл если он находится на расстоянии 2см от заряженной нити с линейной пл-тью заряда (2*10вминусдевятой) Кл/см
Обсуждение
Неизвестный
26.02.2009, 22:29
общий
это ответ
Здравствуйте, Журавлев Ник Алекс!
Найти силу
F=?
действующую на заряд
q= (2/3)*1e-9 Кл
если он находится на расстоянии
a= 2см= 2e-2 (м)
от заряженной нити с линейной пл-тью заряда
т= 2e-9 Кл/см= 2e-7 (Кл/м)
___
из закона Гаусса, так как поле симметричное, то
поток вектора напряженности эл.поля через цилиндр окружающий нить
ФE= S*E= Q/e0= т*L/e0
Площадь цилиндра на расстоянии 'r' от оси
S= 2*pi*r*L
Напряженность поля на расстоянии 'r' От нити
E= т*L/(e0*2*pi*r*L)= т/(2*pi*e0*r)
Сила на расстоянии 'a' от нити
F= E*q= т*q/(2*pi*e0*a)= 2e-9*(2/3)*1e-9/(2*pi*8.854e-12*2e-2)= 1,20E-6 (Н)
Найти силу
F=?
действующую на заряд
q= (2/3)*1e-9 Кл
если он находится на расстоянии
a= 2см= 2e-2 (м)
от заряженной нити с линейной пл-тью заряда
т= 2e-9 Кл/см= 2e-7 (Кл/м)
___
из закона Гаусса, так как поле симметричное, то
поток вектора напряженности эл.поля через цилиндр окружающий нить
ФE= S*E= Q/e0= т*L/e0
Площадь цилиндра на расстоянии 'r' от оси
S= 2*pi*r*L
Напряженность поля на расстоянии 'r' От нити
E= т*L/(e0*2*pi*r*L)= т/(2*pi*e0*r)
Сила на расстоянии 'a' от нити
F= E*q= т*q/(2*pi*e0*a)= 2e-9*(2/3)*1e-9/(2*pi*8.854e-12*2e-2)= 1,20E-6 (Н)
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