  We derived an electrical current formula in the presence of a strong out of
plane magnetic field and an in plane electric field, and within two dimensional
disordered systems. This current is originated from the guiding center
coordinate jump. At a strong magnetic field regime, the current can be pictured
as the migration of the center coordinates. During the electron impurity
scattering, the guiding centers suddenly shift their coordinates. Because of
the electric field, the coordinate shift accumulatively contributes to a
longitudinal current. During the scattering, the value of cyclotron radius
changes, which compensates for the change of the electric potential energy
during the coordinate jump. The diversion of cyclotron radius is the classical
manifestation of electric field dependent broadening and shifting of the Landau
levels.
