2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203269A general derivation of the charging equation of a dust grain is presented, and indicated where and when it can be used. A problem of linear fluctuations of charges on the surface of the dust grain is discussed.Invited Talk National Symposium on Plasma Physics Jan 28, 2008 IslamabadPlasma PhysicsAstrophysicstext