# [SOLVED] Determining current and drift speed

by octahedron
Tags: current, determining, drift, solved, speed
 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: $$n = \frac{I_{1}}{(Aev_{d_1})} = 2*10^{28}$$ Also, I reached to this relationship between $$I_2$$ and $$v_{d_2}$$: $$I_{2} = 20000v_{d_2}$$ What to do next? Appreciate any pointers, and thanks in advance.
 P: 39 Ah, again, I_2 = I_1. *smacks head* This solves the problem.

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