Question: Based on the table, if the temperature changes from 25°C to 65°C in a 105-m section of 9.5 Ã 103-m diameter wire, approximately how much
A. 0.04 Ω
B. 0.4 Ω
C. 4.0 Ω
D. 40 Ω
Electric power is generally transmitted to consumers by overhead wires. To reduce power loss due to heat, utility companies strive to reduce the magnitudes of both the current (I) through the wires and the resistance (R) of the wires. A reduction in R requires the use of highly conductive materials and large wires. The size of wires is limited by the cost of materials and weight. The table lists the resistances and masses of 1000-m sections of copper wires of different diameters at two different temperatures.
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Diameter Resistance Resistance per 10m at 25C (per 101 m at 65C Mass per 101 m (kg) 6.6x 102 2.9 x 10-2 2.1 x 102 9.5 x 103 7.2 x 103 3.5 x 102 7.1 x 102 3.4 x 101 8.2 x 103 4.1 x 102 8.2 x 10-2 3.8 x 10-1 2.4 x 10 4.6 x 10 2.3 x 103 4.9 x 102
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