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Консультация № 168530
30.05.2009, 00:46
0.00 руб.
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По прямому проводу течет ток 75 А. В магнитном поле этого тока "висит" алюминиевая квадратная рамка с током 15 А. Расстояние от тока до ближайшей стороны рамки 7,5 см. Найти сторону рамки, если сечение провода рамки 1.5 мм^2. Стороны рамки параллельны прямому току.
Обсуждение
Неизвестный
30.05.2009, 02:18
общий
Что-то у меня не получается даже бесконечно длинный провод рамки подвесить.
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магнитное поле на расстоянии
R= 7.5 см от длинного провода с током
I1= 75 А
B= mu0*I/(2*pi*R)= 4*pi*10^-7*75/(2*pi*7.5e-2)= 2,0E-4 (Тл)
погонная сила Ампера для бесконечного "рамочного" провода
Fa= B*I2*L= 2.0e-4*15*L= 3,00E-3 (Н/м)
погонный вес бесконечно длинного "рамочного" провода
Fg= rh*s*L= 2.7e3*1.5e-6*L= 4,05E-3 (Н/м) > Fa
___
а у рамки еще три стороны добавляются, вес еще больше.
___
магнитное поле на расстоянии
R= 7.5 см от длинного провода с током
I1= 75 А
B= mu0*I/(2*pi*R)= 4*pi*10^-7*75/(2*pi*7.5e-2)= 2,0E-4 (Тл)
погонная сила Ампера для бесконечного "рамочного" провода
Fa= B*I2*L= 2.0e-4*15*L= 3,00E-3 (Н/м)
погонный вес бесконечно длинного "рамочного" провода
Fg= rh*s*L= 2.7e3*1.5e-6*L= 4,05E-3 (Н/м) > Fa
___
а у рамки еще три стороны добавляются, вес еще больше.
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