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“ 场”和“ 路”是电磁学中的两个基本内容, 它们在物理内容上有着内在的联系, 而在研究方法上又有所
区别. 由此简要回顾对电磁场和电路问题的基本认识; 给出电磁场物理量与电路物理量的对应关系; 从电荷守恒和
电磁场方程出发, 推导出直交流电路均适用的基尔霍夫第一、 第二方程式, 指出直流电路的基尔霍夫方程式只是其
中的特例 相似文献
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Lorentz变换和Maxwell方程的最简单形式 总被引:2,自引:0,他引:2
用Cifford代数来描述,Lorents变换和Maxwell方程组变得非常简单。例如,Maxwell方程成为□F=4πj/c,只一个方程就够了。 相似文献
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本文由电磁波的麦克斯韦方程组出发,介绍导出折射定律和反射定律的一种证明方法.其证明方法,使用了空间微元近似,然后推广至全空间传播的方法,从而简化了麦克斯韦方程组求解的烦琐过程,提出了一种可教学推广的实用性方法.通过使用微元法,求解得到麦克斯韦方程的行波解形式,即得出电磁场是一种行波.由电磁场的向量形式推导空间中电磁波的折射、反射定律,得到折射、反射定律的证明并不需要电磁波的解析形式,在连续函数的情形下是普遍成立的.求解过程中加深对麦克斯韦方程组的理解,体现了电磁过程的深刻物理图像,也为由几何光学向波动光学过渡提供一种思想上的指导. 相似文献
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Production of Squeezed State of Single Mode Cavity Field by the Coupling of Squeezed Vacuum Field Reservoir in Nonautonomous Case 总被引:1,自引:0,他引:1
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The dissipative and decoherence properties as well as the asymptotic behaviour of the single mode electromagnetic field interacting with the time-dependent squeezed vacuum field reservoir are investigated in detail by using the algebraic dynamical method. With the help of the left and right representations of the relevant hw(4) algebra, the dynamical symmetry of the nonautonomous master equation of the system is found to be su(1, 1). The unique equilibrium steady solution is found to be the squeezed state and any initial state of the system is proven to approach the unique squeezed state asymptotically. Thus the squeezed vacuum field reservoir is found to play the role of a squeezing mold of the cavity field. 相似文献
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Influence of External Magnetic Field on Anomalous Skin Effects in Inductively Coupled Plasmas
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Using a one-dimensional slab model, we study the influence of the external static magnetic field on the anomalous skin effects in the inductively coupled plasma. The rf electromagnetic field in the plasma is determined by solving the linearized Boltzmann equation incorporating with the Maxwell equations. The numerical results show that,due to the existence of the external magnetic field, the anomalous skin effects are greatly enhanced and the number of regions with negative absorption is decreased. 相似文献
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通过完整的麦克斯韦方程和相对性原理导出电场强度、磁感应强度、电位移矢量、磁场强度、电荷体密度和电流密度矢量的相对论变换. 相似文献
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通过分析指出:电磁场是一个不可分割的整体,Maxwell方程组是电磁场的运动方程,电磁场的源是电荷与电流的分布,Jefimenko公式是真空中Maxwell方程组的解。 相似文献
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Exact solution of Einstein's field equations is obtained for massive string cosmological model of Bianchi III space-time using the technique given by Letelier (1983) in presence of perfect fluid and electromagnetic field. To get the deterministic solution of the field equations the expansion 0 in the model is considered as proportional to the eigen value σ2^2of the shear tensor σi^j and also the fluid obeys the barotropic equation of state. It is observed that in early stage of the evolution of the universe string dominates over the particle whereas the universe is dominated by massive string at the late time. It is also observed that the string phase of the universe disappears in our model because particle density becomes negative. Some physical and geometric properties of the model are also discussed. 相似文献