R=p*L/A
Area = 3*(6,5*10^-2)²
Area = 3*42,25*10^-4
Area = 126,75*10^-4m²
R = L/A
12 = L / 126,75*10^-4
L = 12*126,75*10^-4
L = 1521 * 10^-4
L = 0,1521 Ohms
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L ~= 0,15 Ohms (aproximadamente)
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