Question: The (United States) National Electric Code, which sets maximum safe currents for insulated copper wires of various diameters, is given (in part) in the table.

The (United States) National Electric Code, which sets maximum safe currents for insulated copper wires of various diameters, is given (in part) in the table. Plot the safe current density as a function of diameter. Which wire gauge has the maximum safe current density? ("Gauge" is a way of identifying wire diameters, and 1 mil = 10-3in.)

10 12 14 16 18 40 4 Gauge Diameter, mils 204 162

10 12 14 16 18 40 4 Gauge Diameter, mils 204 162 129 102 81 64 51 25 20 15 35 50 Safe current, A 70

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