载流导体径向电场的数值估算

Numerical value estimation of radial electric fields inside conductor carrying a steady current

应用经典电磁理论,推出了载有恒定电流导体内部存在径向电场的表达式,并对导体内部的径向电场及表面电势进行了估算.结果表明,导体内径向电场是微小的.计算出电流强度为200A,导线截面为1cm2的铜导线,其内部径向电场强度约为1.13×10-6V/m.

The formula of the radial electrical field inside the conductor carrying a steady current is derived according to the classical electromagnetic theory, an estimate is made of the radial electrical field inside the conductor and the potential at the surface of the wire. The result shows that the magnitude of the radial electrical field is approximately equal 1.13×10^(-6)V/m for a copper conductor of cross section 1 cm^2 carrying 200 A current.