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Determining current and drift speed 
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#1
Mar508, 07:32 PM

P: 39

1. The problem statement, all variables and given/known data
The two wires in the above figure are made of the same material. What are the current and the electron drift speed in the 2.0mmdiameter segment of the wire. 2. Relevant equations I = J/A; J = n*e*v_d where n is the density of the conductor in m^3 and v_d is drift velocity. 3. The attempt at a solution I was able to find the density of the conductor: [tex]n = \frac{I_{1}}{(Aev_{d_1})} = 2*10^{28}[/tex] Also, I reached to this relationship between [tex]I_2[/tex] and [tex]v_{d_2}[/tex]: [tex]I_{2} = 20000v_{d_2}[/tex] What to do next? Appreciate any pointers, and thanks in advance. 


#2
Mar608, 08:52 PM

P: 39

Ah, again, I_2 = I_1. *smacks head* This solves the problem.



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