l=6m
S=2mm^2=2*10^-6 m^2
U=5v
d=?
I=1,5A
R=dl/S
R=U/I
U/I=dl/S
d=US/lI
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Do ostaniego wzoru podstawiasz:
d=(5*2*10^-6)/(6*1,5)=(10^-5)/9=(okolo)=1.11*10^-4 OHM*metr
d=US/lI=5V*2*10^-6m^2/6m*1,5A=1,(1)*10^-6=1,11*10^-6 Ω*m