Self-induction and drude equation

Tags: drude, equation, selfinduction
 P: 16 why are the effects of self-induction not taken into account when writing electron transport equations in conductors under effect of emf such as with drude equation?
 Sci Advisor Thanks P: 1,924 The Drude equations apply a statistical model to point charges distributed within a conductor. The boundaries of a conductor constrain the movement of those charge carriers. Self-inductance is a parameter applied externally to the geometrical shape of the conductor. The magnetic forces between charges moving due to the Drude applied EMF are perpendicular to the electric forces due to the same applied EMF. Those magnetic forces will ensure that the electrons remain distributed throughout the section of the conductor, which is an assumption of the Drude model.
 P: 16 can you please clarify the relation between these magnetic forces and drude equation?
 Sci Advisor Thanks P: 1,924 Self-induction and drude equation There is no relation between magnetic forces and the Drude model. The Drude model applies to the inside of a very short conductor. Self inductance applies to the outside of a longer conductor. They are independent concepts.
 P: 16 so, what exactly happens in an electric circuit when a current is switched on from the microscopic point of view?
 P: 16 your reply was extremely helpful. i understand that Maxwell's equations in material media will be the basis of explanation. emphasis on role of surface and boundaries was illuminating. i began reading about skin effect and suchlike. my own thinking usually revolves about DC circuits containing chemical source for EMF attached to a wire having resistance and inductance, trying to visualize the static conditions prior to starting the current and the transient behaviour of electron currents. my understanding was that there is some kind of lag of the current behind the value obtained in Ohm's law, trying to visualize this as some kind of electron inertia plus back EMF. i know that these are rough approximations to Maxwell's equations, but simple models might be helpful to begin with.

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