Mobility of Charge Carrier DefinitionMobility of charge carriers is defined as the ratio of drift velocity to the applied electric field in a conductor. Drift velocity depends on two factors: the intensity of the electric field and the conductor’s mobility. For the same electric field, different metals will have different drift velocities due to their unique mobility of charge carriers.In metals, the band of valence electrons may not be completely filled, allowing free electrons to move. These f