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Question 20241
JEE Physics · Medium

Magnetism: Current Loop vs Dipole — Field MCQ

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Current Loop vs Dipole — FieldMediumQuestion 20241

Question

Far from a small current loop with magnetic moment m, the field at axial distance d is:
  1. A
    μ₀m/4πd³
  2. B
    μ₀m/2πd³
  3. C
    2μ₀m/4πd³
    Correct
  4. D
    μ₀m/πd³

Correct answer

2μ₀m/4πd³

Explanation

B_axial = 2μ₀m/(4πd³) = μ₀m/(2πd³) — exactly like the axial field of a magnetic dipole (bar magnet).

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