Workalemahu, Bantikassegn2018-06-192023-11-092018-06-192023-11-091984-06http://10.90.10.223:4000/handle/123456789/1674Motion of charqec1 part.icles in magnetic and/or electric fields (from simple to cOInnlex fonfigurations) is discussed in chapter one as a necessary backaround for the understanding of the orbit theory of particles in a special confiqura~· tion presented in the last chapter. Fundamental concepts regarding- confinina and heating of plasma and the energy irlterchange bet\~een waves and plasma particles have been dealt ~lith in chapters blo and three. I>lith the help of circularly polarized fields and a coordinate system that rotates with E, the nature of the averaqeforce and pseudoj1otential, instantantaneous rate of energy gain ane. its dependence on angle X have been inves·tiqated in chapter fourenElectromagnetic Filed of Mode TE 111Thesis