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Homework Help: Drude Model Current Density

  1. May 6, 2013 #1
    1. The problem statement, all variables and given/known data
    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

    2. Relevant 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

    3. 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.....
  2. jcsd
  3. May 6, 2013 #2


    User Avatar
    Homework Helper

    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.

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