Practice portal › Current Electricity › Electric Current and Drift Velocity
Asked in GSEB Board July 2022 · Drift velocity, mobility and current density
Idea: in a steady field the drift speed is proportional to the field, and mobility is the constant of proportionality.
|⃗v_d|=μ E.
So μ=(|⃗v_d|)/E: the drift speed gained per unit electric field.
Its unit is m² V⁻¹ s⁻¹, and for an electron μ=(eτ)/m, where τ is the relaxation time.
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