[SOLVED] Determining current and drift speed

by octahedron
Tags: current, determining, drift, solved, speed
octahedron is offline
Mar5-08, 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 2.0mm-diameter 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.
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octahedron is offline
Mar6-08, 08:52 PM
P: 39
Ah, again, I_2 = I_1. *smacks head* This solves the problem.

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