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Posted by **samantha** on Wednesday, November 21, 2012 at 11:38pm.

Your help is much appreciated! :)

- Physics. Free electron density, please help! -
**Count Iblis**, Wednesday, November 21, 2012 at 11:52pmCompute 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.

- Physics. Free electron density, please help! -
**drwls**, Wednesday, November 21, 2012 at 11:53pmCall 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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