Using an arbitrary initial unipolar space‐charge distribution consisting of two species of charge carriers of different but constant mobilities in a medium, relations for the electric fields and charge‐carrier densities are derived as functions of positions and time. The highly nonlinear, one‐dimensional equations, which are derived for swarms of charge carriers between parallel plane electrodes with a fixed potential difference, include the effects of the space‐charge fields. A general method is outlined which, in principle, can be used to generate a second order differential equation whose solution predicts the time‐dependent current caused by the drifting space‐charge swarm. The general equations are applied to the special case where the initial space‐charge distributions are uniform in a solid or fluid medium. Although the resulting differential equation is complicated, the equation is in a form such that its solutions could be computer generated.

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