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Помогите пожалуйста с физикой!!!! 1)Четыре одинаковых заряда Q1=Q2=Q3=Q4=40нКл закреплены в вершинах квадрата со стороной а=10см. Определить напряжённость электрического поля Е в месте нахождения одного из зарядов а также силу F? действующую на этот заряд со стороны трёх других. 2)На тонком стержне длиной L равномерно распределён заряд с линейной плотностью= 1нКл/м. Найти потенциал фи, Созданный этим стержнем в точке,расположенной на его оси и удалённой от ближайшего конца на растояние L. Зарание большое спасибо!!!!!
Здравствуйте, yliia. Первая задача уже рассматривалась в системе. Смотрите вопрос №168714 (https://rfpro.ru/question/168714) Согласно правилам, при указании в ответе на решение данной задачи в другом вопросе необходимо приводить также текст данного решения (ниже приведён отредактированный вариант указанного ответа: проведено форматирование + исправлена ошибка в 2 раза) Цитата: вопрос №168714, ответ эксперта Гардукевич Роман Эдуардович
Рассмотрим влияние на шар с зарядом Q4. На него действует 3 силы F(1-4), F(2-4), F(3-4). Каждая сила - сила кулона. По формуле : F=k*Q1*Q2/(εR2) Расстояние R(1-4)=a, R(2-4)=a*[$8730$]2, R(3-4)=a. Далее получаем по сложению векторов, что F(равнодейств.)=[$8730$](F(1-4)2+F(3-4)2)+F(2-4) Учтём, что диэлектрическая проницаемость среды ε=1, так как о ней ничего не говорится(следовательно,можно считать, что это воздух или вакуум).
В итоге получаем после всех преобразований: F=q2*k*([$8730$]2+0,5)/a2. После подстановки значений получим : F=2,7 *103=2,7 мН
Решение второй задачи [$966$]=l2l[$8747$]dQ/(4*π*ε0*x)=l2l[$8747$]τ*dx/(4*π*ε0*x)=τ/(4*π*ε0*x)*ln(x)|l2l=τ*ln(2)/(4*π*ε0*x) (т.к. Q=τ*l) Подставив числовые данные получим приблизительно 6,2 В
vitalkise: ВВCodе в ответах Вам по статусу ещё не положен. Ответ вечером отформатирую. Кстати, что там делает *x? (проинтегрировано правильное выражение с /x)
vitalkise: И ещё такой совет: заключайте знаменaтель, содержащий умножение (по крайней мере, если в нём присутствует знак умножения) в скобки во избежание неоднозначности.
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