# Finding length and diameter of copper wire!

by dev-hud
Tags: copper, diameter, length, wire
 P: 1,398 You can compute the volume of the wire from the mass and the density. If you know the diameter is equal to d, you can compute the length of the wire (from the equation for the volume of a cylinder) If you know the length and the diameter, you can compute the resistance (resistivity of copper is $1.72 \cdot 10^{-8} \Omega m$ ) The resistance will be a function of the chosen diameter d. Set this equal to 0.5 and you can find d