Chapter 29 Maxwell,s Equations and Electromagnetic Waves 3) Although I and ld are equivalent at producing magnetic field, they are different in that displacement current is varying electric field 位移电流是变化的电场,可以存在于一切物质或真空中而 传导电流是导体中电荷的定向运动Chapter 29 Maxwell’s Equations and Electromagnetic Waves (3) Although I and Id are equivalent at producing magnetic field, they are different in that displacement current is varying electric field. 位移电流是变化的电场,可以存在于一切物质或真空中而 传导电流是导体中电荷的定向运动