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Здравствуйте,эксперты. Вот вам задачки))))) 1) Две одинаковые круглые пластины площадью S=400см^2 каждая расположены параллельно друг другу. Заряд одной пластины Q1=400нКл,другой Q2=-200нКл. Определить силу F взаимного притяжения пластин,если расстояние между ними: а) r1=3мм; б) r2=10м
2) По проводнику сопротивлением r=8 Ом течет равномерно возрастающий ток. За время t=8 с в проводнике выделилась теплота Q=500 Дж. Определить заряд q,протекающий за это время по проводнику. В момент времени,принятый за начальный,ток в проводнике был равен нулю.
3) Воздух ионизируется рентгеновскими лучами. Определить удельную проводимость воздуха,если в объёме V=1 см^3 газа находится в условиях равновесия n=10^8 пар ионов.
Если решите,то буду очень благодарен)))
Обсуждение
Неизвестный
10.02.2009, 21:36
общий
это ответ
Здравствуйте, Алик К! Решение: 1) Дано: S = 400см^2 = 4*10^-2м^2; Q1 = 400нКл = 4*10^-7Кл; Q2 = -200нКл = -2*10^-7Кл; r1 = 3мм = 3*10^-3м; r2 = 10м; k0 = 9*10^9 Н*м^2/Кл^2 – электрическая постоянная. Сила взаимодействия двух круглых пластин: F = (k0*|σ1|*|σ2|)/r^2, где σ1 и σ2 – поверхностная плотность зарядов пластин, определяемая по формуле: σ = Q/S. Определим σ1 = Q1/S = (4*10^-7Кл)/(4*10^-2м^2) = 10^-5 Кл/м^2. Определим σ2 = Q2/S = (-2*10^-7Кл)/(4*10^-2м^2) = -0,5*10^-5 Кл/м^2.
Определим силу взаимодействия F1 (случай r1 = 3мм): F1=(k0*|σ1|*|σ2|)/r1^2=(9*10^9 Н*м^2/Кл^2*10^-5 Кл/м^2*0,5*10^-5 Кл/м^2)/(3*10^-3м)^2 = 5*10^4 Н = 50кН. Определим силу взаимодействия F2 (случай r2 = 10м): F2=(k0*|σ1|*|σ2|)/r2^2=(9*10^9Н*м^2/Кл^2*10^-5 Кл/м^2*0,5*10^-5 Кл/м^2)/(100м^2) = = 4,5мН. Ответ: F1 = 59кН. F2 = 4,5мН.
Неизвестный
11.02.2009, 01:53
общий
11.02.2009, 10:03
это ответ
Здравствуйте Алик. ______________________________ По-моему эксперт Скоморохов Владимир Иванович ошибся решая первую задачу.
Причем у него неправильны оба варианта и (а) и (б).
По-моему надо решать так: ____________________________________________ 1) Две одинаковые круглые пластины площадью S=400см^2= 4e-2 (м^2) каждая расположены параллельно друг другу. Заряд одной пластины Q1=400нКл другой Q2=-200нКл. Определить силу F=? взаимного притяжения пластин,если расстояние между ними: а) r1=3мм; б) r2=10м ___ Диаметр пластин d= (4/pi)*sqrt(S)= (4/pi)*sqrt(4e-2)= 0.25 (м)
В случае (а) d >> r1 поэтому вычисления можно делать как для бесконечных плоскостей.
А в случае (б) d << r2 поэтому вычислять надо как для точечных зарядов ______ а) Напряженность создаваемая первой пластиной E1= b/(2*e0)=(Q1/S)/(2*e0)= 400e-9/(2*4e-2*8.854e-12)= 5,65E5 (Н/Кл) здесь b= Q/S, плотность заряда на пластине (имеется в виду греческая "сигма малая") e0= 8.854e-12 (Ф/м), электрическая постоянная в системе СИ
Сила действующая на заряд 'q' если на него действует поле напряженностью 'E' F= E*q F= E1*Q2= 5.65e5*(-200e-9)= -0,113 (Н), знак минус означает притяжение ______ б) E1= Q1/(4*pi*e0*r2^2)= 400e-9/(4*pi*8.854e-12*10^2)= 36.0 (Н/Кл)
F= 36.0*(-200e-9)= -7,20E-6 (Н)
_____________________________________ 2) По проводнику сопротивлением r=8 Ом течет равномерно возрастающий ток. За время t=8 с в проводнике выделилась теплота Q=500 Дж. Определить заряд q=? протекающий за это время по проводнику. В момент времени,принятый за начальный,ток в проводнике был равен нулю I(0)= 0 ___ dQ= r*I^2*dt
Так как по условию ток растет равномерно, то для вычисления заряда его можно заменить средним током Isr= (I(0)+I(8))/2= 4.84/2= 2.42 (А)
Искомый заряд q= Isr*t= 2.42*8= 19.4 (Кл)
_____________________________________ 3) Воздух ионизируется рентгеновскими лучами. Определить удельную проводимость воздуха g=? если в объёме V=1 газа находится в условиях равновесия n=10^8 (1/см^3)= 1e14 (1/м^3) пар ионов. ___ Из справочника коэф. подвижности ионов при p= 1 атм и t= 18 oC азот b(+)= 1.27 (см^2/(сек*В))= 1.27e-4 (м^2/(сек*В)) b(-)= 1.84 (см^2/(сек*В))= 1.84e-4 (м^2/(сек*В))
кислород b(+)= 1.29 b(-)= 1.79
Так как воздух в основном состоит из азота, то использую числа для азота. Или можно уменшив точность принять b(+)= 1.3e-4 (м^2/(сек*В)) b(-)= 1.8e-4 (м^2/(сек*В)) _______ Плотность тока в газе (при малых напряженностях) j= n*e*(b(+)+ b(-))*E
Удельная проводимость g= j/E= n*e*(b(+)+ b(-))
g= 1e14*1.60e-19*(1.27e-4+ 1.84e-4)= 5.0E-9 (См/м) или (1/(Ом*м))
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