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Question 20215
JEE Physics · Hard

Semiconductors: Mobility Definition MCQ

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Mobility DefinitionHardQuestion 20215

Question

Carrier mobility μ is defined as:
  1. A
    Drift velocity per unit current
  2. B
    Drift velocity per unit electric field
    Correct
  3. C
    Diffusion coefficient
  4. D
    Conductivity per unit carrier density

Correct answer

Drift velocity per unit electric field

Explanation

μ = v_d/E (m²/(V·s)). Conductivity σ = n_e q μ_e + n_h q μ_h. For Si: μ_e ≈ 0.14 m²/Vs, μ_h ≈ 0.05 m²/Vs. Electrons have higher mobility than holes in most semiconductors.

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