This research deals with covering of a metal film on the semi-infinite dielectric in the presence of a weak external magnetic field. A charged projectile has been considered flying above the thin film. The surface wave frequencies of the system were derived by means of the quantum hydrodynamic theory through the appropriate boundary conditions. The energy loss of charged particle in the present system was also investigated. It is found that the external magnetic field modifies the distribution of electron gas density as well as the energy loss of flying charged particle.
