For a simple metal where there is only one type of charge carrier (electrons), the Hall voltage V H can be derived by using the Lorentz force and seeing that, in the steady-state condition, charges are not moving in the y -axis direction. Thus, the magnetic force on each electron in the y -axis direction is cancelled by a y -axis electrical force due to the buildup of charges. The v x term is the drift velocity of the current which is assumed at this point to be holes by convention. The v x B z term is negative in the y -axis direction by the right hand rule.