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Question 20198
JEE Physics · Hard

Magnetism: Bar Magnet — Axial Point MCQ

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Bar Magnet — Axial PointHardQuestion 20198

Question

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

Correct answer

2μ₀m/4πd³

Explanation

Axial (end-on) field: B = 2μ₀m/(4πd³) = μ₀m/(2πd³), directed along m (N to S outside the magnet).

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