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Консультация № 181837
11.01.2011, 20:51
49.06 руб.
0
1
1
Здравствуйте! Прошу помощи в следующем вопросе:
плоский конденсатор заряжен до разности потенциалов 300В .Расстояние между пластинами 5 мм , диэлектрик - стекло.Определить напряженность поля в стекле,поверхностную плотность заряда на пластинах и поверхностную плотность связанных поляризационных зарядов на стекле?
СПАСИБО!
плоский конденсатор заряжен до разности потенциалов 300В .Расстояние между пластинами 5 мм , диэлектрик - стекло.Определить напряженность поля в стекле,поверхностную плотность заряда на пластинах и поверхностную плотность связанных поляризационных зарядов на стекле?
СПАСИБО!
Обсуждение
12.01.2011, 06:09
общий
это ответ
Здравствуйте, смирнов игорь!
Так как в задаче не оговорено значение [$949$] для стекла беру среднее значение - 6.
Напряженность поля в стекле (диэлектрик) равна:
E=[$963$]д/([$949$]*[$949$]0)=[$963$]/[$949$]0=U/d (для плоского конденсатора)
Е=300/0.005=6*104 (В/м)=60 (кВ/м)
Поверхностная плотность заряда на пластинах равна:
[$963$]д=U*[$949$]*[$949$]0/d
[$963$]д=300*6*8.85*10-12/0.005=3.186*10-6 (Кл/м2)=3.186 (мкКл/м2)
Поверхностная плотность связанных зарядов равна:
[$963$]св=[$963$]д - [$963$]=[$949$]*[$949$]0*Е - [$949$]0*Е=[$949$]0*([$949$] - 1)*Е
[$963$]св=8.85*10-12*(6 - 1)*6*104=2.655*10-6 (Кл/м2)=2.655 (мкКл/м2)
Будут вопросы обращайтесь в минифорум.
Удачи
Так как в задаче не оговорено значение [$949$] для стекла беру среднее значение - 6.
Напряженность поля в стекле (диэлектрик) равна:
E=[$963$]д/([$949$]*[$949$]0)=[$963$]/[$949$]0=U/d (для плоского конденсатора)
Е=300/0.005=6*104 (В/м)=60 (кВ/м)
Поверхностная плотность заряда на пластинах равна:
[$963$]д=U*[$949$]*[$949$]0/d
[$963$]д=300*6*8.85*10-12/0.005=3.186*10-6 (Кл/м2)=3.186 (мкКл/м2)
Поверхностная плотность связанных зарядов равна:
[$963$]св=[$963$]д - [$963$]=[$949$]*[$949$]0*Е - [$949$]0*Е=[$949$]0*([$949$] - 1)*Е
[$963$]св=8.85*10-12*(6 - 1)*6*104=2.655*10-6 (Кл/м2)=2.655 (мкКл/м2)
Будут вопросы обращайтесь в минифорум.
Удачи
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