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Консультация № 183128
11.05.2011, 13:33
44.77 руб.
0
2
2
Здравствуйте! У меня возникли сложности с такими вопросами:
1. Шар, погруженный в масло (ε = 2,2), имеет поверхностную плотность заряда σ = 1 мкКл/м2 и потенциал φ = 500 В. Определите заряд шара.
2. Определите плотность тока, если за 2 с через проводник сечением 1,6 мм2 прошло 2•10^19 электронов.
1. Шар, погруженный в масло (ε = 2,2), имеет поверхностную плотность заряда σ = 1 мкКл/м2 и потенциал φ = 500 В. Определите заряд шара.
2. Определите плотность тока, если за 2 с через проводник сечением 1,6 мм2 прошло 2•10^19 электронов.
Обсуждение
Неизвестный
11.05.2011, 14:42
общий
это ответ
Здравствуйте, Дмитрий!
Дано:
ε = 2,2
σ = 1 мкКл/м2 = 10-6 Кл/м2
φ = 500 В
Найти:
q - ?
Решеие:
Заряд шара равен: q = σS = σ 4πR2
Потенциал шара равен:
φ = q/(4πεε0R) = σR/εε0
отсюда соответственно и выражаем радиус шара:
радиус шара равен:
R = (εε0φ)/σ
R = (2.2*8.85*10-12*500)/10-6 = 9.74 (мм)
и полученное значение радиуса подставляем в первую формулу, для заряда шара, и подставляя численные данные получаем:
q = 1.191*10-9 (Кл) = 1,191 (нКл)
Ответ:1,191 нКл
Дано:
ε = 2,2
σ = 1 мкКл/м2 = 10-6 Кл/м2
φ = 500 В
Найти:
q - ?
Решеие:
Заряд шара равен: q = σS = σ 4πR2
Потенциал шара равен:
φ = q/(4πεε0R) = σR/εε0
отсюда соответственно и выражаем радиус шара:
радиус шара равен:
R = (εε0φ)/σ
R = (2.2*8.85*10-12*500)/10-6 = 9.74 (мм)
и полученное значение радиуса подставляем в первую формулу, для заряда шара, и подставляя численные данные получаем:
q = 1.191*10-9 (Кл) = 1,191 (нКл)
Ответ:1,191 нКл
5
11.05.2011, 15:06
общий
это ответ
Здравствуйте, Дмитрий!
Решение второй задачи
Дано:
t=2 c
S=1.6мм2=1.6*10-6м2
N=2*1019
e=1.6*10-19 Кл
---------------------------
j-?
Решение:
плотность тока
j=I/S
Сила тока
I=q/t
q=N*e
тогда получаемя для плотности тока
j=N*e/(S*t)
подставим численные значения
j=2*1019*1.6*10-19 Кл/(1.6*10-6м2*2c)=1*106 A/м2
Ответ: j=1 A/мм2
Решение второй задачи
Дано:
t=2 c
S=1.6мм2=1.6*10-6м2
N=2*1019
e=1.6*10-19 Кл
---------------------------
j-?
Решение:
плотность тока
j=I/S
Сила тока
I=q/t
q=N*e
тогда получаемя для плотности тока
j=N*e/(S*t)
подставим численные значения
j=2*1019*1.6*10-19 Кл/(1.6*10-6м2*2c)=1*106 A/м2
Ответ: j=1 A/мм2
5
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