摘要
交流电源产生的电动势在电路内产生了电势差以及交变纵向电场。交变电场在金属导线内的速度不是常数,它与电路参数相关。在大多数情况下,交变电场的速度是低于光速的。可是,在特定的电路参数情况下,交变电场的速度超过光速20倍以上。本文分析了RL电路中交变电场的时间延迟问题,并且推导出了导线中交变电场的速度公式。
AC electromotive force generates alternating potential differences and longitudinal electric fields in a circuit. The speed of alternating electric field within the metal wire is not constant, which is related to the circuit parameters. In most cases, the speed of alternating electric field is lower than the speed of light. However, under certain circuit parameters, the speed of alternating electric field can be 20 times more than the speed of light. This paper analyzes the time delay of the alternating electric field in RL circuits. The formula of the speed of alternating electric field in a wire is deduced.
出处
《现代物理》
2015年第2期35-39,共5页
Modern Physics
