Drift Velocity
Drift velocity v_d relates to current I by I = ?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- drift velocity
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
nAevd
- Theory: Current is the total charge passing through a cross-section per unit time.
- Variables:
- n: Number density of free electrons (electrons/m3).
- A: Cross-sectional area of conductor (m2).
- e: Magnitude of electronic charge (C).
- vd: Average drift velocity (m/s).
- Derivation: In time Δt, electrons travel a distance vdΔt. The volume containing these electrons is AvdΔt. Total charge ΔQ=(n⋅AvdΔt)⋅e.
- Current Formula: I=ΔtΔQ=nAevd.
This medium difficulty physics question is from the chapter current electricity, covering the topic of drift velocity. It appeared in the 2025 exam.
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