Drift Velocity
Easyphysics
If the drift velocity of electrons in a conductor is v, what happens to it when the current is doubled (assuming constant cross-section)?
Select the correct option:
Solution
Incorrect! Answer:
Becomes 2v
- Current Equation: The macroscopic current I is related to microscopic drift velocity vd by:
- I=nAevd.
- Analyze Parameters:
- n (charge density), A (area), and e (electronic charge) are constants for the given conductor.
- Proportionality: I∝vd. This means current and drift velocity are directly linked.
- Conclusion: If current I doubles (2I), then the drift velocity vd must also double to 2v.
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- drift velocity
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Becomes 2v
- Current Equation: The macroscopic current I is related to microscopic drift velocity vd by:
- I=nAevd.
- Analyze Parameters:
- n (charge density), A (area), and e (electronic charge) are constants for the given conductor.
- Proportionality: I∝vd. This means current and drift velocity are directly linked.
- Conclusion: If current I doubles (2I), then the drift velocity vd must also double to 2v.
This easy 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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