Voltage and electromotive force or emf are very fundamental quantities in engineering, physics and technology. Yet there are few texts on these quantities that are suitable for advanced under graduates or graduate students at university. Dr. Frederick J. Young of the Carnegie Institute of Technology remedies this lack with his eminently readable textbook Magnetically Induced Electromotive Force. Dr. Young has found current sources exhibit no real understanding of emf. In the age of instant access via the Internet, most sources have not yet learned the contents in this book by Dr. Young. Thus, it is an important milestone in academics as well as popular knowledge. With a concise text leavened with illustrations, pictures and diagrams, electromotive force as originally conceived by the English genius Michael Faraday and its subsequent development in the fields where it applies is given its rightful place among important scientific subjects. Young starts with a rigorous derivation of a formula for the calculation of emf that is based on the velocity of the conductors through magnetic fields. Attention is then devoted to emf calculation in rigid and nonrigid configurations. Numerous examples of its use are given and worked from the viewpoint of various observers. This book is wide-ranging as well as filled with examples for the varieties of theories involved. Complete field solutions are given to verify assumptions commonly made in calculating emf. Many long standing apparent paradoxes and general fallacies concerning Faraday disc generators are explained several different ways. A complete three dimensional solution is given for the Faraday-like disc generators of Foucault and Le Roux. There is also a wealth of history and historical personalities in this book, making it interesting reading for those concentrating on emf history as well as those who need to study its formulas and equations. Other important topics discussed show how the calculation of emf is expedited by the special theory of relativity set forth by Albert Einstein in 1905. The Maxwell-Lorentz Transformation is used to extend the calculation of emf to include dielectrics and electrically conducting fluids in motion. The constitutive equations of media are studied in cases involving relative motion. Cases are disclosed where the fields may be zero to one observer and not zero to another. The theory of an optimum taper is developed in a general fashion and is applied to the case in which the transmission-line type pulse-transformer is nominally matched at both ends. All in all, this is the most complete book on emf and corollary topics to date.
PDF
