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A certain wire has a length L and a resistance R. It is stretched uniformly to a length of 2L. The resistance of the wire after it has been stretched is When a current ows in an aluminum wire of diameter 3.15 mm, the drift speed of the conduction electrons is 0.000101 m/s. How many electrons are owing past a given point each second? The conduction electron density in aluminum is 6.00 X 1028 m'3. You measure the current through a 21.9 $2 resistor to be 619 mA. What is the potential difference across the contacts of the resistor? Find the drift velocity vd of conduction electrons in a gold wire of diameter 1.33 mm when a current of 0.361 A ows in it. The density of conduction electrons in gold is 5.90 X 1028 m'3. 2.26 x105 vd = m/s Incorrect Given that copper's temperature coefcient of resistivity is about 3.9 X 103 C_1, to What temperature must you raise a copper wire originally at 18.5 C in order to double its resistance? Neglect any changes in dimensions. Does this happen in household wiring under ordinary circumstances? 0 yes 0 no Question Credit: OpenStax College Physics