Impossibility of reduction of electromagnetic fields in free space for nonzero-mass system

1971 ◽  
Vol 2 (14) ◽  
pp. 712-714
Author(s):  
B. S. Rajput
Keyword(s):  
Electromagnetic Fields ◽  
Free Space ◽  
Mass System

scholarly journals Scattering of a Plane Wave by an Anisotropic Plasma-Coated Conducting Sphere

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
You-Lin Geng
Keyword(s):  
Plane Wave ◽  
Electromagnetic Fields ◽  
Anisotropic Medium ◽  
Free Space ◽  
Numerical Results ◽  
Wave Functions ◽  
Vector Wave ◽  
Homogeneous Plasma ◽  
Conducting Sphere ◽  
Spherical Vector

The electromagnetic field in homogeneous plasma anisotropic medium can be expressed as the addition of the first and second spherical vector wave functions in plasma anisotropic medium. The tangential electromagnetic fields are continued in the boundary between the homogeneous plasma anisotropic medium and free space, and the tangential electrical field is zero in the surface of conducting sphere. The coefficients of electromagnetic fields in plasma anisotropic medium expanded in terms of spherical vector wave functions in plasma anisotropic medium are derived, and then the coefficients of scattering fields in terms of spherical vector functions in free space can be obtained. Numerical results between this paper and hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA) are given, and they are in agreement very well. Some new numerical results of a plane wave scattering by an anisotropic plasma-coated conducting sphere are obtained.

Electromagnetic Fields Produced by Self-Accelerating Shape-Preserving Electrons in Free-Space

CLEO: 2014 ◽  
2014 ◽  
Author(s):  
Ido Kaminer ◽  
Jonathan Nemirovsky ◽  
Mikael Rechtsman ◽  
Rivka Bekenstein ◽  
Mordechai Segev
Keyword(s):  
Electromagnetic Fields ◽  
Free Space ◽  
Shape Preserving

On the integration of Maxwell’s equations, and charge and dipole fields

1964 ◽  
Vol 279 (1379) ◽  
pp. 562-571 ◽  
Keyword(s):  
Electromagnetic Fields ◽  
Free Space ◽  
Integral Identity ◽  
Maxwell’S Equations ◽  
Maxwell's Equations ◽  
Direct Integration ◽  
Magnetic Dipoles ◽  
Dimensional Integral

It is shown how the direct integration of Maxwell’s equations for free space may be accomplished by using a four-dimensional integral identity constructed for this purpose. The method is applied to the calculation of the electromagnetic fields of moving electric charges, and electric and magnetic dipoles.

Asymptotic expansions for transient electromagnetic fields

Geophysics ◽  
1982 ◽  
Vol 47 (1) ◽  
pp. 38-46 ◽  
Author(s):  
T. Lee
Keyword(s):  
Half Space ◽  
Electromagnetic Fields ◽  
Asymptotic Expansions ◽  
Free Space ◽  
Layered Structures ◽  
Two Dimensional ◽  
Host Medium ◽  
Transient Electromagnetic ◽  
Axisymmetric Structure ◽  
Transient Voltage

Asymptotic expansions may be derived for transient electromagnetic (EM) fields. The expansions are valid when [Formula: see text] is less than about 0.1. Here l, σ, [Formula: see text], and t are the respective lengths, conductivities, permeabilities of free space and time. Cases for which asymptotic expansions are presented include (1) layered grounds, (2) axisymmetric structure, and (3) two‐dimensional (2-D) structures. In all cases the transient voltage eventually approaches that of the host medium alone, the ratio of anomalous response to the half‐space response being proportional to [Formula: see text]. Here v is equal to 0.5 for layered structures and 1.0 for 2-D or 3-D structures.

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