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دانلود رایگان کتاب Electromagneticfield theory for physicists and engineers Fundamentals and Applications

دانلود رایگان کتاب

Electromagneticfield theory for physicists and engineers Fundamentals and Applications

Magnetosphere_rendition

This book starts with a brief review of Maxwell’s equations, which are the
fundamental laws that, together with the theory of electromagnetic behavior
of matter, explain on a macroscopic scale the properties of the electromagnetic
field, the relationships of this field with its sources, and its interaction with matter. The reader is assumed to be familiar with these equations at least at an
undergraduate level. Next, after reviewing other fundamental topics such as constitutive parameters and boundary conditions, we apply the energy-conservation
law to a bounded volume, limited by a surface S, inside of which there exists a
time-variable electromagneticfield. We shall see that when the energy balance
is formulated, there appears a term representing a flow of energy carried by the
electromagneticfield through the surfaceSthat limitsV. This term leads us to the definition of Poynting’s vector. Similarly, when the law of conservation of momentum is applied to the same region, wefind that the electromagnetic field also carries a momentum density, which can also be expressed in terms of Poynting’s vector.

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