Undertaking the study of behaviour of a spin-in monopole moving in the fiel
d of mother monopole, Dirac's equation has been solved for energy eigen val
ues and the Hamiltonian of this system has been shown to involve spin contr
ibution. Spin momentum of a monopole has been shown to behave as extra ener
gy source for monopoles interacting with electromagnetic field. Interaction
of spin and orbital moments of a monopole moving in the electromagnetic fi
eld has been analysed. S-matrix expansion, scattering amplitude and total H
amiltonian for monopole-anti-monopole scattering has also been undertaken.
Study of bound state of a monopole and an anti-monopole has been carried ou
t and it has been shown that this state is very short lived and decays in t
o two or three photons depending on the spin-statistics of the monopoles in
volved.