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3. Look up tabulated conductivities (or resistivities) of copper, silver, and
aluminum at 20 °C and calculate the resistance of a copper wire that is 2
meters long with a1 mm diameter. Repeat your calculation for silver, and for
aluminum. The density of free electrons is 8.5x1028 particles/m3 for copper,
5.86x 102 m-3 for silver, and 18.1x1028 m-3 for aluminum. For a potential
difference of 5 volts, how do the electron drift velocities in each of the three
wires compare with one another?

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