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Current Electricity: Drift Velocity Comparison MCQ

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Drift Velocity ComparisonHardQuestion 31674

Question

A wire is connected to a battery. If cross-section of one half is double the other (same material), ratio of drift velocities (thin:thick) is:
  1. A
    1:2
  2. B
    2:1
    Correct
  3. C
    1:1
  4. D
    4:1

Correct answer

2:1

Explanation

I = nAev_d = constant (same current). v_d × A = constant. If A₂ = 2A₁, then v_d1/v_d2 = A₂/A₁ = 2. Thinner part has larger drift velocity.

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