Предмет: Физика, автор: donylucker

во сколько раз сопротивление железной проволоки, длинной 1 м. больше сопротивления медной проволоки той же длинны и c такой же площадью поперечного сечения.

Ответы

Автор ответа: ramit08

1

R=pl/S
l1=l2
S1=S2
p1=0,10 Ом*мм квадратное/ м
Þ2= 0,0175 Ом·мм²/м.=0,0175*10^-6 Ом*м.
R1/R2=p1/p2=(0,1/0,0175) Ом·мм²/м=5,7
Ответ: в 5,7 раза

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