Предмет: Физика, автор: lizamoroz2002

Сопротивление никелевой проволоки длиной 98 м равно 9 Ом. Определить площадь поперечного сечения проволоки

Ответы

Автор ответа: katrinborovik

Дано: l=98 м, R=9 Ом, p(материал)=0,4 Ом*мм²/м
Найти: S - ?
Решение:
Найдем площадь поперечного сечения S исходя из формулы сопротивления R. Если R=pl/s, то s=pl/R.
s=0,4*98/9≈4,4 мм²
Ответ: 4,4 мм²

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