Register to reply

Determining current and drift speed

by octahedron
Tags: current, determining, drift, solved, speed
Share this thread:
octahedron
#1
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.
Phys.Org News Partner Science news on Phys.org
Security CTO to detail Android Fake ID flaw at Black Hat
Huge waves measured for first time in Arctic Ocean
Mysterious molecules in space
octahedron
#2
Mar6-08, 08:52 PM
P: 39
Ah, again, I_2 = I_1. *smacks head* This solves the problem.


Register to reply

Related Discussions
Another Current and Drift Velocity Question Introductory Physics Homework 2
Current and Drift Velocity (multiple choice) Introductory Physics Homework 1
Determining Peak Current Introductory Physics Homework 3
Current and Drift Speed Introductory Physics Homework 1
Current and Drift Velocity Introductory Physics Homework 2