﻿ 交变电场速度测量的物理原理 Physical Principles of Measuring the Speed of Alternating Electric Field

Modern Physics
Vol.05 No.02(2015), Article ID:14949,5 pages
10.12677/MP.2015.52005

Physical Principles of Measuring the Speed of Alternating Electric Field

Tsao Chang1,2, Kongjia Liao1

1Department of Nuclear Science and Technology, Fudan University, Shanghai

2Department of Electronics and Electrical Engineering, Nanyang Institute of Technology, Nanyang Henan

Received: Mar. 2nd, 2015; accepted: Mar. 13th, 2015; published: Mar. 18th, 2015

ABSTRACT

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.

Keywords:RL Circuit, Speed of Alternating Electric Field, Time Delay, Superluminal Speed

1复旦大学，核科学与技术系，上海

2南阳理工学院，电子与电气工程学院，河南 南阳

1. 引言

2. 实验的原理图

Figure 1.Display of time delay, 6.0 m, 2.0 MHz

Figure 2. Schematic diagram of RL circuit

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3. 导线中交变电场的速度公式

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4. 讨论

Physical Principles of Measuring the Speed of Alternating Electric Field[J]. 现代物理, 2015, 05(02): 35-39. http://dx.doi.org/10.12677/MP.2015.52005

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