What is Not Directly Proportional to Current Density in the Drude Model?

[timothyhenry]

Homework Statement

In the drude model of electrical conduction, the current density (J) is not directly proportional to :
a. The average time interval between sucessive collisions
b. the number of charge carriers per unit volume
c. The square of the electron charge
d. The electric field presents in the wire
e. Resistivity of the wire

Homework Equations

J= (n.e).Vd
J = current density
n = volume charge density
Vd = drift velocity

n = ρ.Na/Mr
Na=avogadro's number
Mr = relative mass

The Attempt at a Solution

I can't figure out the connections to the problems... There are maybe more equations to this but i don't really know which one...

 

[ehild]

You need the formula for the drift velocity in terms of the charge and mass of electron, the electric field d strength, and time between collisions.

ehild