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What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter? 0.10 Ohm 0.25 Ohm 0.30 Ohm 0.40 Ohm

What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter? 0.10 Ohm 0.25 Ohm 0.30 Ohm 0.40 Ohm

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What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053 − m m diameter? 0.10 O h m 0.25 O h m 0.30 O h m 0.40 O h m

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You are an expert witness, having been hired by an attorney who is defending a wire manufacturing company in a lawsuit. The company is being sued by a firm that manufactures electronic measurement devices. The wire company provides copper wires with precision lengths and radii to be used in thermal measurement devices manufactured by the device firm. The device firm lost a major contract due to inaccuracy of their thermal measurement device. This firm is claiming that the precision of the wires provided by the wire company was not sufficient. You have inspected the wires in the laboratory and have found the lengths to be precise and the radii to be uniform, well within the specifications provided by the device firm. You report this information during the trial, and the legal team for the device firm looks frustrated. The lawyer confers with his client, jumps up, and says, "The wire company did not allow for thermal expansion of the wire! From 20∘C to 85.0∘C, thermal expansion could make a difference of several percent in the resistance of the wire!" A recess in the trial is called until the next day while you perform some calculations to determine the percentage by which thermal expansion would change the resistance of a wire so that you can report your result. (Assume the coefficient of linear expansion is 17.0×10−6(∘C)−1.) %

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