\(R=\dfrac{U}{I}=\dfrac{12}{0,1}=120\left(\Omega\right)\)
\(R=\rho\dfrac{l}{S}\Rightarrow S=\dfrac{\rho.l}{R}=\dfrac{0,4.10^{-6}.6}{120}=2.10^{-8}\left(m^2\right)\)
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