Posted by samantha on Wednesday, November 21, 2012 at 11:38pm.
Compute the current I using Ohm's law.
The flux of free electrons F is the free electron density tomes the drift velocity v. If you multiply this flux by the electron charge and the cross section, you get the current. By equating this with what you get from Ohm's law, you can thus solve for the free electron density.
Call the free electron density N, m^-3
e = electron charge , Coulombs
V = electron drift speed
I = current, Amps
A = cross sectional area, pi r^2, m^2
I = N*A*e*V
Solve for N in this case.
Get the current I from ohms law. I = V/R
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