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Question 20197
JEE Physics · Hard

Magnetism: Magnetic Field of Bar Magnet — Equatorial MCQ

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Magnetic Field of Bar Magnet — EquatorialHardQuestion 20197

Question

At the equatorial point of a short bar magnet (magnetic moment m, distance d), field B is:
  1. A
    μ₀m/4πd³
    Correct
  2. B
    μ₀m/2πd³
  3. C
    2μ₀m/4πd³
  4. D
    μ₀m/4πd²

Correct answer

μ₀m/4πd³

Explanation

Equatorial (broadside-on) field: B = μ₀m/(4πd³), directed anti-parallel to m. Axial field is twice this: 2μ₀m/(4πd³).

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