po=2.7*10^-8 Ом*м L=20 м R=2.8 Ом S=?
R=po*L/S S=po*L/R=2.7*10^-8*20/2.8=19.3*10^-8 м2 (≈0,2 мм кв)
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po=2.7*10^-8 Ом*м L=20 м R=2.8 Ом S=?
R=po*L/S S=po*L/R=2.7*10^-8*20/2.8=19.3*10^-8 м2 (≈0,2 мм кв)
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