J. PoulterMahidol University2018-02-272018-02-271994-12-01Journal of Physics A: Mathematical and General. Vol.27, No.13 (1994), 4645-4652030544702-s2.0-36149031217https://repository.li.mahidol.ac.th/handle/123456789/9611Within the framework of Feynman path integration, expectation values of quantum mechanical operators may be exactly obtained for a class of time-dependent problems. Attention is focused on the two-dimensional motion of a charged particle in a perpendicular magnetic field with a time-dependent driving force. A harmonic oscillator potential is included to ensure that the corresponding density matrix is properly defined although some expectation values are defined without it. This potential is at least a mathematical convenience. Some discussion concerning the conditions under which steady states may be attained is also included.Mahidol UniversityMathematicsPhysics and AstronomyArticleSCOPUS10.1088/0305-4470/27/13/037