Determining current and drift speed

  • Thread starter octahedron
  • Start date
  • #1
37
0
[SOLVED] Determining current and drift speed

Homework Statement



http://img162.imageshack.us/img162/145/problemrg5.jpg [Broken]

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.

Homework 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.

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.
 
Last edited by a moderator:

Answers and Replies

  • #2
37
0
Ah, again, I_2 = I_1. *smacks head* This solves the problem.
 

Related Threads on Determining current and drift speed

  • Last Post
Replies
1
Views
4K
Replies
7
Views
5K
Replies
1
Views
15K
  • Last Post
Replies
0
Views
3K
  • Last Post
Replies
2
Views
3K
N
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
4K
  • Last Post
Replies
0
Views
2K
  • Last Post
Replies
2
Views
2K
Top