Physics

Drift Velocity and Mobility

अपवाह वेग और गतिशीलता

In Class 12 Physics, Chapter 3: Current Electricity, this topic explains how charge carriers move through a conductor when an electric field is applied. Students learn that drift velocity is the average directed speed acquired by electrons, despite their random thermal motion, and understand its relation to current, charge density, and the number of carriers. The topic also introduces mobility, defined as drift velocity per unit electric field, and connects it with relaxation time and electrical conductivity.