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Two different approaches, referred to as Bu and Ej, can\udbe used to examine the time development of electric fields and currents in\udspace plasmas based on the fundamental laws of physics. From the Bu\udapproach, the required equation involves the generalized Ohm's law with some\udsimplifying assumptions. From the Ej approach, the required equation can be\udderived from the equation of particle motion, coupled self-consistently with\udMaxwell's equation, and the definition of electric current density.\udRecently, some strong statements against the Ej approach have been made. In\udthis paper, we evaluate these statements by discussing (1) some limitations\udof the Bu approach in solving the time development of electric fields and\udcurrents, (2) the procedure in calculating self-consistently the time\uddevelopment of the electric current in space plasmas without taking the curl\udof the magnetic field in some cases, and (3) the dependency of the time\uddevelopment of magnetic field on electric current. It is concluded that the\udEj approach can be useful to understand some magnetospheric problems. In\udparticular, statements about the change of electric current are valid\udtheoretical explanations of change in magnetic field during substorms

Time development of electric fields and currents in space plasmas