Question

What is the difference between drift velocity and mobility? ​

Answer 1

Answer:

1. The drift velocity is average velocity acquired by the electrons inside the conductor when it is subjected to an electric field. Mobility of an electron is defined as the magnitude of the drift velocity per unit electric field.

Answer 2

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Drift velocity is defined as average velocity with which free electrons get drifted towards the positive end of a conductor under the influence of the external electric field.

Mobility μ is defined as the magnitude of drift velocity per unit electric field.

➩ The average drift velocity of carriers per unit electric field in a homogeneous semiconductor. Also known as mobility.

➩ Drift velocity is the average velocity with which electrons 'drift' in the presence of an electric field. It's the drift velocity (or drift speed) that contributes to the electric current. In contrast, thermal velocity causes random motion resulting in collisions with metal ions.

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