alleryThe axial field of a short bar magnet of moment m at large distance r is
AB_axial = (μ₀/4π) · (m / r²)
BB_axial = (μ₀/4π) · (2m / r²)
CB_axial = (μ₀/4π) · (2m / r³)
DB_axial = (μ₀/4π) · (m / r³)
Answer & Solution
Correct answer: C. B_axial = (μ₀/4π) · (2m / r³)
Axial field: (μ₀/4π)·(2m/r³) — analogous to electric dipole axial field 2p/(4πε₀r³).
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