JEE Physics · Medium

Magnetism: Solenoid Field Calculation MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Solenoid Field CalculationMediumQuestion 20204

Question

A solenoid has 2000 turns, length 0.5 m, and carries 3 A. The field inside is (μ₀ = 4π×10⁻⁷):
  1. A
    1.5×10⁻² T
  2. B
    2.4π×10⁻³ T
  3. C
    4.8π×10⁻³ T
    Correct
  4. D
    1.2×10⁻² T

Correct answer

4.8π×10⁻³ T

Explanation

n = 2000/0.5 = 4000 turns/m. B = μ₀nI = 4π×10⁻⁷ × 4000 × 3 = 4.8π×10⁻³ T ≈ 1.508×10⁻² T.