It is my great pleasure to thank Prof. A. K. Sarkar (Dean ID) and Prof. Ved Prakash of BITS, Pilani, who have encouraged me to write this book.
I am deeply indebted to Prof. H.O. Gupta, Head of Electrical Engineering of IIT, Roorkee, for his valuable comments and suggestions. I am thankful to Prof. P. P. Sengupta and Prof. A. K. Dey of NIT, Durgapur; Prof. A. K. Mukhopadhaya, Vice Chancellor of Tripura University; Prof. A. K. Deb, Prof. G. Sarkar and S. Sengupta from the Department of Applied Physics, University College of Science and Technology, Calcutta University, for their support.
I also wish to record my gratitude to the editorial team of Pearson Education for their valuable contribution in bringing out this book.