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所在平台: Udemy |
课程主页: https://www.udemy.com/course/electro-magnetic-fields-waves/
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课程名称:电磁场与波 课程概述:本课程面向电子与通信工程学士学位的学生,旨在帮助他们掌握电磁学的基本知识,从而在考试中获得优异成绩。随着技术的进步,电磁学在现代社会中发挥着至关重要的作用。传统的电路和网络理论仅描述电压、电流和电阻等参数,无法提供电场强度、衰减常数、相位常数、波长等关键参数,因此电磁场理论成为网络理论的重要补充。 课程内容: 第一部分:介绍场的基本概念,包括矢量场和标量场、单位矢量、位置矢量和距离矢量等。 第二部分:讲解矢量代数,包括点积规则、矢量代数和矢量微积分的一些基本公式,以及右手法则、矢量的标量三重积和标量三重积的详细讨论,这些都是解决电磁场理论问题所必需的。 第三部分:回顾坐标系统,包括笛卡尔坐标系统、圆柱坐标系统和球坐标系统。同时讨论坐标点变换(如笛卡尔到圆柱坐标的转换),以及 DEL 运算符的定义、用途和在散度、旋度和梯度运算中的应用。介绍散度定理和斯托克斯定理的数学方法。 第四部分:讨论库仑定律及其矢量形式,分析n个电荷的库仑定律以及不同电荷分布(如点电荷、无限直线电荷、面电荷和体电荷)下的电场强度。同时,讨论电通量密度与电场强度的公式,以及高斯定律及其应用。 第五部分:讨论与磁统计相关的H分量,包括磁统计的基本概念和比奥-萨伐尔定律,以计算循环电流的H和磁场强度H。介绍安培电路定律及其在无限直线元件、圆盘和无限电荷面等的应用,讨论磁通和磁通密度、磁标量和磁矢量势。进一步探讨不同磁场下的力(如安培力、洛伦兹力等)以及时间变化场的麦克斯韦方程(法拉第定律、变压器电动势和感应电动势)和不同介质的边界条件。 第六部分:介绍波和电磁波的概念,讨论介质和导体中的波动方程,进一步探索电场与磁场的关系(E/H或本征阻抗等)。 如果您在学习过程中有任何疑问,请随时提出。祝您学习愉快! ——Skill Gems Education, PUDI V V S NARAYANA
This course is for those who are pursuing a bachelor's degree in electronics and communications engineering and is an advantage for them to get good knowledge and score well in the examinations.Nowadays, electromagnetics plays a vital role because of the advancements in technology. Electronic circuits and network circuits have the limitation that they only describe the voltage, current resistance, etc., but they cannot give the electric field intensity, attenuation constant, phase constant, lambda, or wavelength types of parameters. Therefore, network theory fails to give the above parameters. So electromagnetic field theory is the advancement of network theory.In this subject, you may know some fundamental concepts.Section 1: Deals with the the field, vector and scalar fields, unit vectors, position vectors ,distance vectors etc.,Section 2: Deals about vector algebra, which includes the dot product rules, some basic formulas of vector algebra and vector calculus, the cork screw rule, and the vector scalar triple product and scalar triple product discussed elaborately, which are required for solving the problems in electromagnetic fields theory.Section 3: This is all about the review of coordinate systems, which include the cartesian coordinate system or rectangular coordinate system, cylindrical coordinate system, and spherical coordinate system. Next, we discussed point transformations like rectangular to cylindrical or vice versa as well as cylindrical to spherical or vice versa. We also discussed what the DEL operator is, why it was used, and how these del operators are used for divergence, curl, and gradient operations with some sort of rule. Next we also discussed the statements and mathematical approach of divergence theorem, curl for stokes theorem etc., Section 4: Discussed Coulomb's law and vector form. Coulomb's law for n number of charges, electric field intensity, and finding the electric field intensity for different charge distributions like point charge, infinite line and sheet charge and volume charge, etc., also find the electric flux density from the electric field intensity formulas. next we discussed the gauss law and its applications Section 5: This section is all about the magnetostatics related to the H component. he first concept is the introduction of magnetostatics and Biot-Savarts law for finding H and magnetic field intensity H for circular loop. The next one is Amperes circuit law and its applications like infinite line elements, circular disc, and infinite sheet of charge etc., next is magnetic flux and magnetic flux density, magnetic scalar and magnetic vector potentials, etc. later force due to different magnetic fields like.Amperes force law , Lorentz force etc.,Maxwell's equations for time varying fields like faraday's law, transformer emf, and induced emf combined both the inconsistency of ampere's law or modified ampere's law and displacement current density. finally boundary conditions for different medias like dielectric-Dielectric and conductor Section 5: Deals with what is a wave and an electromagnetic wave, and then the wave equations for dielectrics and conductors. Later we find the E/H or intrinsic impedance etc.,Feel free to ask any doubts while learning the courseHappy learning!Skill Gems EducationPUDI V V S NARAYANA