Transient fields for an electric dipole in a dissipative medium

1970 ◽  
Vol 48 (16) ◽  
pp. 1858-1862 ◽  
Author(s):  
James R. Wait ◽  
Kenneth P. Spies
Keyword(s):  
Magnetic Field ◽  
Dielectric Constant ◽  
Electric Dipole ◽  
Homogeneous Medium ◽  
Step Function ◽  
Dissipative Medium ◽  
Electric And Magnetic Field ◽  
Displacement Currents ◽  
Explicit Expressions

Explicit expressions are presented for the electric and magnetic field components of a step-function excited electric dipole immersed in an infinite homogeneous medium with a specified conductivity and dielectric constant. It is shown that displacement currents influence only the early part of the waveform.

VERTICAL DIPOLE RADIATION IN MILNE UNIVERSE

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1533-1536
Author(s):  
CIPRIAN DARIESCU ◽  
MARINA-AURA DARIESCU
Keyword(s):  
Magnetic Field ◽  
Radial Component ◽  
Current Amplitude ◽  
Excitation Current ◽  
Gauge Invariant ◽  
Dipole Radiation ◽  
Radiated Power ◽  
Electric And Magnetic Field ◽  
Invariant Formulation ◽  
Explicit Expressions

The aim of the present work is to study, within an SO(3, 1)-gauge invariant formulation, the vertical dipole radiation perceived by an observer in Milne Universe. Using the explicit expressions of the radial component and the declination of the four potential, we compute the electric and magnetic field intensities and the effective radiated power, in terms of the excitation current amplitude feeding-in the radiating system.

scholarly journals Computation of per-unit-length internal impedance of a multilayer cylindrical conductor with possible dielectric layers

2020 ◽  
Vol 33 (4) ◽  
pp. 605-616
Author(s):  
Dino Lovric ◽  
Slavko Vujevic ◽  
Ivan Krolo
Keyword(s):  
Magnetic Field ◽  
Maxwell Equations ◽  
Bessel Functions ◽  
Unit Length ◽  
Dielectric Layers ◽  
Electric And Magnetic Fields ◽  
Electric And Magnetic Field ◽  
Internal Impedance ◽  
Novel Method ◽  
Displacement Currents

In this manuscript, a novel method for computation of per-unit-length internal impedance of a cylindrical multilayer conductor with conductive and dielectric layers is presented in detail. In addition to this, formulas for computation of electric and magnetic field distribution throughout the entire multilayer conductor (including dielectric layers) have been derived. The presented formulas for electric and magnetic field in conductive layers have been directly derived from Maxwell equations using modified Bessel functions. However, electric and magnetic field in dielectric layers has been computed indirectly from the electric and magnetic fields in contiguous conductive layers which reduces the total number of unknowns in the system of equations. Displacement currents have been disregarded in both conductive and dielectric layers. This is justifiable if the conductive layers are good conductors. The validity of introducing these approximations is tested in the paper versus a model that takes into account displacement currents in all types of layers.

The Fields Close to a Radiating Aerial

1929 ◽  
Vol 25 (4) ◽  
pp. 491-507 ◽  
Author(s):  
E. B. Moullin
Keyword(s):  
Magnetic Field ◽  
Exact Solution ◽  
Electric Dipole ◽  
Maxwell's Equations ◽  
Alternating Current ◽  
Great Distance ◽  
Energy Output ◽  
Radio Communication ◽  
Electric And Magnetic Field ◽  
Great Development

This paper is concerned with the electric and magnetic field close to conductors which carry an alternating current. Hertz's famous solution of Maxwell's equations gave the field at a great distance from a magnetic or electric dipole whose moment was alternating harmonically: but from its very character it could not describe the field at points which were insufficiently remote from the origin for the source to appear as a dipole. The great development of radio communication has made important certain problems about the field in the vicinity of wires which are carrying an alternating current. Thus imagine that an aerial of some thousand feet in height and very many acres in extent has been erected. Before the designer of this vast and costly structure can calculate the rate of energy output, he must suppose himself so far removed that the aerial has dwindled to a mere speck in the aether. Such a process must seem both unsatisfactory and unsatisfying to those who take the responsibility of obtaining radio communication. It is already known that the field at any point can be expressed formally when the distribution of current and charge in the source is postulated: it is shown in this paper that the field at all points very near to the source can be expressed by simple formulae. Of course it is not an exact solution for the field due to a conductor of specified shape, because the postulated distribution of current and charge is incorrect.

scholarly journals Electric and Magnetic Field Effects in p-Methoxy Benzylidene p′-n-Butylaniline

1976 ◽  
Vol 31 (3-4) ◽  
pp. 283-287 ◽  
Author(s):  
N. V. S. Rao ◽  
P. R. Kishore ◽  
T. F. S. Raj ◽  
M. N. Avadhanlu ◽  
C. R. K. Murty
Keyword(s):  
Magnetic Field ◽  
Dielectric Constant ◽  
Liquid Crystal ◽  
Magnetic Fields ◽  
Nematic Liquid Crystal ◽  
Nematic Phase ◽  
Relative Effectiveness ◽  
Magnetic Field Effects ◽  
Electric And Magnetic Fields ◽  
Electric And Magnetic Field

Molecular alignment in the nematic phase of p-methoxy benzylidene p′-n-butylaniline (MBBA) in the presence of electric and magnetic fields is investigated. The relative effectiveness of electric and magentic fields on the nematic liquid crystal MBBA is discussed. In the dielectric regime it is found that the threshold fields for chevron formation are considerably different from the threshold fields for inducing changes in the dielectric constant.

INHOMOGENEOUS CYLINDRICAL ORE BODY IN PRESENCE OF A TIME VARYING MAGNETIC FIELD

Geophysics ◽  
1962 ◽  
Vol 27 (3) ◽  
pp. 386-392 ◽  
Author(s):  
Janardan G. Negi
Keyword(s):  
Magnetic Field ◽  
Magnetic Permeability ◽  
Propagation Constant ◽  
Homogeneous Medium ◽  
Step Function ◽  
Practical Case ◽  
Time Varying ◽  
Geophysical Prospecting ◽  
The Core ◽  
Ore Body

The secondary fields are evaluated for the case of an inhomogeneous conducting cylinder embedded in an infinite homogeneous medium under the influence of a time varying magnetic field. Both sinusoidal and step function responses are studied in detail for a practical case of interest in geophysical prospecting in which the exterior medium is relatively poorly conducting, the propagation constant in the cylinder is varying linearly across the section of the core, and the magnetic permeability is the same everywhere.

scholarly journals Method for the Estimation of the Limit Coefficients of Reflection and Transition of a Flat Micro Wave in a Bi-complex Medium

2021 ◽  
Vol 5 (1) ◽  
pp. 94-99
Author(s):  
Antim Hristov Yordanov
Keyword(s):  
Magnetic Field ◽  
Dielectric Constant ◽  
Magnetic Fields ◽  
Magnetic Permeability ◽  
Flat Surface ◽  
Complex Medium ◽  
Radio Waves ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Electric And Magnetic Field

The reaction of different materials to external magnetic fields depends on the frequency of propagation of radio waves in substances and is determined by the dielectric constant, magnetic permeability , by the vectors of the electric and magnetic field. When irradiated with a flat wave on a flat surface, the phenomenon occurs at the boundary between two media, which will be described by an algorithm through reflection and transmission coefficients used in the processing of transmitted and reflected signals from radars, and adopted in radiology as well.

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