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roxiney

Joined: 15 Sep 2010
Posts: 5
Location: north carolina

 Posted: Thu Sep 30, 2010 8:56 pm    Post subject: Current Density A copper wire has a diameter dCu = 0.0571 cm, is L = 4.81 m long, and has a density of charge carriers of 8.50·1028 electrons/m3. As shown in the figure, the copper wire is attached to an equal length of aluminum wire with a diameter dAl = 0.0273 cm and density of charge carriers of 6.02·1028. A current of 0.400 A flows through the copper wire. a) What is the ratio of the current densities in the two wires, JCu/JAl? b) What is the ratio of the drift velocities in the two wires, vd-Cu/vd-Al?
hepcj

Joined: 23 Jun 2007
Posts: 125

 Posted: Fri Oct 01, 2010 7:19 pm    Post subject: Cannot do this question without the diagram.
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