Question:
The drift velocity of electrons in a conductor increases when:
The drift velocity of electrons in a conductor increases when:
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Current density:
\[
J=ne v_d
\]
Hence higher drift velocity produces larger current.
Updated On: May 25, 2026
- Temperature increases only
- Electric field increases
- Length of conductor increases
- Area of cross-section increases
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The Correct Option is B
Solution and Explanation
Concept:
Drift velocity is:
\[
v_d=\frac{eE\tau}{m}
\]
where:
Step 1: Write relation. \[ v_d=\frac{eE\tau}{m} \]
Step 2: Analyze dependence. As electric field increases: \[ v_d \] also increases.
Step 3: Final answer. \[ \boxed{ \text{Electric field increases} } \]
- \(E\) = electric field
- \(\tau\) = relaxation time
Step 1: Write relation. \[ v_d=\frac{eE\tau}{m} \]
Step 2: Analyze dependence. As electric field increases: \[ v_d \] also increases.
Step 3: Final answer. \[ \boxed{ \text{Electric field increases} } \]
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