Drift velocity is the average velocity acquired by charged particles, such as electrons, within a material when influenced by an electric field.The magnitude of drift velocity per unit electric field is defined as mobility. This relationship is given by:m=E∣vd∣⇒∣vd∣=m⋅EFrom this, we understand that:vd∝EThus, the drift velocity is directly proportional to the electric field E. Therefore, the correct relationship is represented by v∝E.