2876497192 - PHYSICS 4B Chapter 25 25.3 Copper has 8.5 10...

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PHYSICS 4B Chapter 25 25.3 Copper has 8.5 10 free electrons per cubic meter. A 71.0-cm length of 12-gauge copper wire, that is 2.05 mm in diameter, carries 4.85 A of current. a) How much time does it take for an electron to travel the length of the wire? b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. c) Generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire? 25.8 Current passes through a solution of sodium chloride. In 1.00 s, 2.68 × 10 16 Na + ions arrive at the negative electrode and 3.92 × 10 16 Cl - ions arrive at the positive electrode. a) What is the current passing between the electrodes? b) What is the direction of the current? 25.9 A copper wire has a square cross section 2.3 mm on a side. The wire is 4.0 m long and carries a current of 3.6 A. The density of free electrons is 8.5 × 10 28 /m 3 . Find the magnitude of a) the current density in the wire; b) the electric field in the wire;
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This note was uploaded on 09/08/2008 for the course PHYS 4B taught by Professor D.v during the Fall '07 term at Evergreen Valley.

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2876497192 - PHYSICS 4B Chapter 25 25.3 Copper has 8.5 10...

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