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Консультация № 189112
07.04.2016, 18:01
0.00 руб.
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3
1
Здравствуйте! Помогите, пожалуйста, с задачей:
В двух противоположных вершинах квадрата со стороной 20 см находятся заряды по 27 пКл, найти напряженность поля в двух других вершинах квадрата
В двух противоположных вершинах квадрата со стороной 20 см находятся заряды по 27 пКл, найти напряженность поля в двух других вершинах квадрата
Обсуждение
07.04.2016, 19:16
общий
это ответ
Здравствуйте, YarLam125!
Дано: q=27 пКл=27*10-12 Кл=2,7*10-11 Кл, r=20 см=20*10-2 м=2,0*10-1 м.
Найти: Е.
Выполним рисунок:
Вычислим абсолютные величины напряжённостей электрических полей каждого из зарядов в одной из не занятых зарядами вершин квадрата:
Вычислим абсолютную величину напряжённости суммарного электрического поля в той же вершине:
Ввиду симметрии квадрата относительно диагонали, на которой расположены заряды, такой же будет напряжённость суммарного электрического поля в противоположной вершине квадрата.
Ответ: 8,6 В/м.
С уважением.
Дано: q=27 пКл=27*10-12 Кл=2,7*10-11 Кл, r=20 см=20*10-2 м=2,0*10-1 м.
Найти: Е.
Выполним рисунок:
Вычислим абсолютные величины напряжённостей электрических полей каждого из зарядов в одной из не занятых зарядами вершин квадрата:
|E1|=|E2|=kq/r2=9*109*2,7*10-11/(2,0*10-1)2=6,075 (В/м).
Вычислим абсолютную величину напряжённости суммарного электрического поля в той же вершине:
|E|=|E1|/cos 45[$186$]=6,075*[$8730$]2[$8776$]8,6 (В/м).
Ввиду симметрии квадрата относительно диагонали, на которой расположены заряды, такой же будет напряжённость суммарного электрического поля в противоположной вершине квадрата.
Ответ: 8,6 В/м.
С уважением.
5
Об авторе:
Facta loquuntur.
Facta loquuntur.
07.04.2016, 19:34
общий
Адресаты:
Пожалуйста. Имейте только в виду, что в рассмотренной точке вектор напряжённости суммарного электрического поля направлен так, как показано на рисунке, а в противоположной вершине квадрата он направлен в противоположную сторону. При этом оба вектора направлены вдоль диагонали квадрата, на которой нет зарядов.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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