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STANDARD Physics Drift Velocity MCQ Question

Type: MCQ-numerical-Medium-Class 12

There is a current of 40 amperes in a wire of 10⁻⁶ m² area of cross-section. If the number of free electrons per m³ is 10²⁹, then the drift velocity will be

A

1.25 × 10⁻³ m/s

B

2.50 × 10⁻³ m/s

C

25.0 × 10⁻³ m/s

D

250 × 10⁻³ m/s

Correct Answer

Option B

Detailed Explanation

The drift velocity V can be calculated using the formula V = I / (nqA). Substituting the given values, V = 40 / (10²⁹ × 1.6 × 10⁻¹⁹ × 10⁻⁶) = 2.5 × 10⁻³ m/s.

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