I. INTRODUCTION
There are only four known ways for the interaction of matter leading to four fundamental types of forces ,viz gravitational interaction (leading to gravitational force) , electromagnetic interaction (leading to electromagnetic forces), strong interaction and weak interaction (leading to what are referred to as nuclear forces).The latter two forces being operative at only very small distances , of the order of the size of the nucleus are thus short-range forces compared to the former two long range ones.The electromagnetic interaction is equally important in that