5. The instructions for an electric lawn mower suggest that a 20 gauge extension cord ( cross sectional area = 5.2 x 10-7 m²) should only be used for distances up to 35 m. For longer distances a 16 gauge extension cord should be used ( cross sectional area = 13 x 107 m² ). The resistivity of copper (used in the extension cord) is 1.72 x 10-8 2.m at 20°C and the temperature coefficient of resistivity of copper is 0.004041 (°C). a. What is the resistance of a 20 gauge extension cord of length 25 m at 20°C? b. What is the resistance of a 20 gauge extension cord of length 80 m at 20°C? c. What is the resistance of a 16 gauge extension cord of length 60 m at 40°C?
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