Physics

Mobility describes how easily charge carriers (electrons or holes) drift through a conductor when pushed by an electric field—it's the ratio of drift velocity to the applied field strength. The key insight is that mobility captures the material's "resistance to motion" at the microscopic level: higher mobility means carriers respond faster to the same field, leading to better conductivity. You'll express it as the proportional relationship $v_d = \mu E$, where the SI unit reveals the fundamental trade-off between motion and field.

Mobility describes how easily charge carriers (electrons or holes) drift through a conductor when pushed by an electric field—it's the ratio of drift velocity to the applied field strength. The key insight is that mobility captures the material's "resistance to motion" at the microscopic level: higher mobility means carriers respond faster to the same field, leading to better conductivity. You'll express it as the proportional relationship $v_d = \mu E$, where the SI unit reveals the fundamental trade-off between motion and field.