r = R*S / l = 2.5Ом * 10*10^-6м² / 0.9*10^3м = 2.8 * 10^-8 Ом*м
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r = R*S / l = 2.5Ом * 10*10^-6м² / 0.9*10^3м = 2.8 * 10^-8 Ом*м
R= p*L/S
S= p*L/R=17/1,1=15,45 мм2 - ответ
3. R=ρ* l/S ρ=R*S/l ρ=2,5*10/900=0,028 Ом*мм2/м