Предмет: Физика, автор: lerahrapatova93

Определите сопротивление медного провода длинной 1 километр и
площадью поперечного сечения 2мм2.

Ответы

Автор ответа: zinovicgrigorij

0

Ответ: 8,5 Ом

Объяснение:

Дано:

l=1км=1000м

S=2мм²

ρ=0,017 Ом*мм²/м

-----------------------

R-?

R=ρ*l/S, где:

ρ-удельное сопротивление меди;

l-длина провода;

S-площадь поперечного сечения провода

R=0,017*1000/2=8,5 Ом

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