Electromagnets

A comprehensive examination of the development and use of electromagnets in the nineteenth century by a prominent engineer and physicist.

Electromagnetics (CC BY-SA 4.0) is an open textbook intended to serve as a primary textbook for a one-semester first course in undergraduate engineering electromagnetics, and includes:electric and magnetic fields; electromagnetic properties of materials; electromagnetic waves; and devices that operate according to associated electromagnetic principles including resistors,capacitors, inductors, transformers, generators, and transmission lines. This book employs the "transmission lines first" approach, in which transmission lines are introduced using a lumped-element equivalent circuit model fora differential length of transmission line, leading to one-dimensional wave equations for voltage and current. This book is intended for electrical engineering students in the third year of a bachelor of science degree program. A free electronic version of this book is available at: https://doi.org/10.7294/W4WQ01ZM

The basic principles are explained with examples from student's daily life situations and every topic is followed by thought-provoking questions. Relevant illustrations have been given, wherever necessary. The language used is simple and lucid which keeps the interest of the students alive till the end of the topic.

This book introduces readers to the characteristic features of electromagnetic phenomena in superconductivity. It first demonstrates not only that the diamagnetism in the superconductivity complies with Maxwell’s theory, which was formulated before the discovery of superconductivity, but also that the dominant E-B analogy in the electromagnetism loses perfection without the superconductivity. The book then explores flux pinning, which is responsible for the non-dissipative current in DC, leading to irreversibility in AC. Drawing on Maxwell’s work, it also proves theoretically that if there is no energy dissipation in the superconductivity caused by the break in time reversal symmetry, it contradicts the thermodynamic principle of energy conservation – something that had previously only been proved experimentally. Lastly, the book addresses the longitudinal magnetic field effect, and explains how this phenomenon leads to a new development of Maxwell’s theory. Featuring numerous appendices to help readers understand the methods of derivation of equations, this book offers students and young scientists an introduction to applied superconductivity, especially in the context of power applications. Presenting the characteristic features of electromagnetic phenomena in superconductivity from basic to advanced topics for applications, the book offers a valuable resource for graduate students and researchers studying superconductivity as well as engineers working in electric utility industry.

How does the imagination work? How can it lead to both reverie and scientific insight? In this book, Kieran M. Murphy sheds new light on these perennial questions by showing how they have been closely tied to the history of electromagnetism. The discovery in 1820 of a mysterious relationship between electricity and magnetism led not only to technological inventions—such as the dynamo and telegraph, which ushered in the “electric age”—but also to a profound reconceptualization of nature and the role the imagination plays in it. From the literary experiments of Edgar Allan Poe, Honoré de Balzac, Villiers de l’Isle-Adam, and André Breton to the creative leaps of Michael Faraday and Albert Einstein, Murphy illuminates how electromagnetism legitimized imaginative modes of reasoning based on a more acute sense of interconnection and a renewed interest in how metonymic relations could reveal the order of things. Murphy organizes his study around real and imagined electromagnetic devices, ranging from Faraday’s world-changing induction experiment to new types of chains and automata, in order to demonstrate how they provided a material foundation for rethinking the nature of difference and relation in physical and metaphysical explorations of the world, human relationships, language, and binaries such as life and death. This overlooked exchange between science and literature brings a fresh perspective to the critical debates that shaped the nineteenth century. Extensively researched and convincingly argued, this pathbreaking book addresses a significant lacuna in modern literary criticism and deepens our understanding of both the history of literature and the history of scientific thinking.

Geo-Electromagnetism surveys the theoretical concepts and applications of electrical prospecting methods. This book is divided into seven chapters that specifically tackle the basic electromagnetic concepts and the special mathematical functions. This text deals first with the numerical and analytical approaches to delineate earth resistivity principles, followed by a description of the three-layer model. These topics are followed by a discussion on the theory of induced electrical polarization. The subsequent chapters are devoted to relevant electromagnetic theory of low-frequency current flow in conducting with varying fields. The discussion then shifts to the geophysical problems associated with vertical electric dipole sources, with an emphasis on the quasi-static range in which all significant distances are small compared with the free-space wavelength. The last chapters outline the relevant analytical development of the magnetotelluric theory and the theoretical principles of the transient electromagnetic methods used in geophysical exploration. Geophysicists, theoreticians, and undergraduate level students will find this book invaluable.