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Консультация № 200274
14.02.2021, 13:01
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Здравствуйте! Прошу помощи в следующем вопросе:
Из нихрома изготовили сплошной брусок в форме прямоугольного параллелепипеда объёмом V=7 см^3. Сопротивление между одной парой его противоположных граней R_1=125 мкОм, а между другой – это R_2=80 мкОм. Найдите сопротивление R_3 между третьей парой его противоположных граней. При измерении сопротивления к соответствующим граням параллелепипеда прижимают пластины из хорошего проводника.
Из нихрома изготовили сплошной брусок в форме прямоугольного параллелепипеда объёмом V=7 см^3. Сопротивление между одной парой его противоположных граней R_1=125 мкОм, а между другой – это R_2=80 мкОм. Найдите сопротивление R_3 между третьей парой его противоположных граней. При измерении сопротивления к соответствующим граням параллелепипеда прижимают пластины из хорошего проводника.
Обсуждение
15.02.2021, 01:20
общий
это ответ
Здравствуйте, kolotaevaliza2004!
Дано:
(нихром)
V=7*10-6м3
R1=125*10-6 Ом
R2=80*10-6 Ом
Найти: R3
Решение:
V=a*b*c (*)
R=[$961$]*l/S (**)
- l - длина проводника;
- S - площадь поперечного сечения;
- [$961$] - удельное сопротивление нихрома находим в справочниках -
[$961$]=110*10-8 Ом*м
Тогда, согласно (**)
R1=[$961$]*с/(a*b) = [$961$]*c2/V [$8658$] c=[$8730$](R1*V/[$961$]) = 2,8*10-2 м;
R2=[$961$]*b/(a*c) = [$961$]*b2/V [$8658$] b=[$8730$](R2*V/[$961$]) = 2,25*10-2 м;
Следовательно, согласно (*)
a=V/b*c = 1,11*10-2 м;
И, окончательно, из (**)
R3=[$961$]*a2/V = 0,2*10-6 Ом = 0,2 мкОм
Удачи
Дано:
(нихром)
V=7*10-6м3
R1=125*10-6 Ом
R2=80*10-6 Ом
Найти: R3
Решение:
V=a*b*c (*)
R=[$961$]*l/S (**)
- l - длина проводника;
- S - площадь поперечного сечения;
- [$961$] - удельное сопротивление нихрома находим в справочниках -
[$961$]=110*10-8 Ом*м
Тогда, согласно (**)
R1=[$961$]*с/(a*b) = [$961$]*c2/V [$8658$] c=[$8730$](R1*V/[$961$]) = 2,8*10-2 м;
R2=[$961$]*b/(a*c) = [$961$]*b2/V [$8658$] b=[$8730$](R2*V/[$961$]) = 2,25*10-2 м;
Следовательно, согласно (*)
a=V/b*c = 1,11*10-2 м;
И, окончательно, из (**)
R3=[$961$]*a2/V = 0,2*10-6 Ом = 0,2 мкОм
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
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