Question

drift velocity per unit electric field is called_____.

Answer 1

Drift velocity per unit electric field is called Electron mobility.

Answer 2

Drift velocity per unit electric field is called mobility of electron or electron mobility.

• The ratio of the drift velocity of the electron to the electric field is called electron mobility.
• Higher the drift velocity of an electron, the more will be its mobility.
• It is denoted by the symbol "μ".
• Its SI unit is m²/ V.s
• μ   ∝    drift velocity
• Mathematical equation for electron mobility is:

        electron mobility = drift velocity (v) / electric field(E)

                                μ   = v / E