In this book, the authors gather and present current research in the study of the principles, engineering applications and biophysical effects of electromagnetic fields. Topics discussed include the thermodynamics of surface electromagnetic waves; exposure to magnetic fields produced by power lines; microwave heating for metallurgical engineering; the effect of electromagnetic fields exposure on cytokines production; high frequency induction heating for high quality injection moulding; electromagnetic techniques for non-invasive detection of malignancies in biological tissue; the entropy production rate in a cell under electromagnetic field; studies of cerebral activity in humans and in animal models after exposure to modulated radio frequency of mobile phones; electromagnetic induction data sets in archaeology; and single and two-photon interactions of radiators with electromagnetic bath.