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Applications
Polarization of Dielectric Sphere .....
Polarization of Dielectric Sphere .....
Authors
:
Prof. EL MAHDI ASSAID
,
E. H. EL HAROUNY, A. IBRAL, S. NAKRA MOHAJER and J. EL KHAMKHAMI
0
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In this worksheet, we investigate the polarization of a dielectric sphere (dot) with a relative permittivitty "epsilon[Dot]" embedded in a dielectric matrix with a relative permittivitty "epsilon[Matrix]" and submitted to an uniform electrostatic field F oriented in z-axis direction. It's a fondamental and popular problem present in most of electromagnetism textbooks. First of all, we express Poisson equation in appropriate coordinates system: "Delta V(r,theta,phi) = 0". We proceed to a full separation of variables and derive general expression of scalar electrostatic potential V(r,theta,phi). Then we particularize to a dielectric sphere surrounded by a dielectric matrix and give expressions of electrostatic potential V(r,theta) in the meridian plane (x0z) inside and outside the sphere by taking into account: i) invariance property of the system under rotation around z-axis, ii) choice of the plane z=0 as a reference of scalar electrostatic potential, iii) regularity of V(r,theta) at the origine and very far from the sphere, iv) continuity condition of scalar electrostatic potential V(r,theta) at the sphere surface, v) continuity condition of normal components of electric displacement field D at the sphere surface. The obtained expressions of V(r,theta) inside and outside the sphere allows as to derive expressions of electrostatic field F, electric displacement field D and polarization field P inside and outside dielectric dot in spherical coordinates as well as in cartesian rectangular coordinates. The paper is a proof of Maple algebraic and graphical capabilities in tackling the resolution of Poisson equation as a second order partial differential equation and also in displaying scalar electrostatic potential contourplot, electrostatic field lines as well as fieldplots of F, D and P inside and outside dielectric sphere.
Application Details
Publish Date
:
September 18, 2017
Created In
:
Maple 15
Language
:
English
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Tags
electrical
pde
differential-equation
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