求解大块导体中的电流分布问题,须用欧姆定律的微分形式j=бE (1)它确定导体中任一点的电流密度 j 和该点的电场强度 E 的关系,б是导体在该点的电导率。在稳定电流情况,j、E 以及电荷分布都不随时间改变,所以(1)式中的 E 指的是静电场,解决问题的途径应当是:由空间的电荷分布利用库仑定律求出导体中的电场分布,再由 To solve the problem of the current distribution in a bulk conductor, the differential form of Ohm’s law, j = бE (1), is used to determine the current density j at any point in the conductor and the electric field strength E at that point. Conductivity. In the case of steady current, j, E and the charge distribution do not change with time, so (1) where E refers to the electrostatic field, the way to solve the problem should be: the space charge distribution using Coulomb’s law to find the conductor Electric field distribution, again by