Engineering electromagnetics

The applications involving electromagnetic fields are so pervasive that it is difficult to estimate their contribution to the industrial output: generation of electricity, power transmission lines, electric motors, actuators, relays, radio, TV and microwave transmission and reception, magnetic storage, and even the mundane little magnet used to hold a paper note on the refrigerator are all electromagnetic in nature. One would be hard pressed to find a device that works without relaying on any electromagnetic principle or effect. This text provides a good theoretical understanding of the electromagnetic field equations but also treats a large number of applications. In fact, no topic is presented unless it is directly applicable to engineering design or unless it is needed for the understanding of another topic. In electrostatics, for example, the text includes discussions of photocopying, ink-jet printing, electrostatic separation and deposition, sandpaper production, paint spraying, and powder coating. In magnetics, the applications discussed include electric motors, implantable magnets, nuclear magnetic resonance, magnetic stirring of molten materials, and electromagnetic braking and bearings. Electric motors and transformers are used to demonstrate the ideas of magnetic forces and torques and of induction; the applications discussed include the new super-efficient electric drives, linear induction motors, and implantable transformers to power life-sustaining devices. The discussion of wave-propagation phenomena will include applications of new materials to aerospace systems, such as the so-called stealth materials, as well as the use of electromagnetic weaves for materials processing, such as grain drying with microwaves, microwave detection of explosives, and remote sensing of the earth and its resources.