alleryThe far-field of a bar magnet at distance r >> l is similar to that of
AA point monopole
BAn electric dipole, with the substitution (1/4πε₀) → (μ₀/4π) and p → m
CA point charge
DA long straight current
Answer & Solution
Correct answer: B. An electric dipole, with the substitution (1/4πε₀) → (μ₀/4π) and p → m
The dipole analogy: bar-magnet far-field obeys the same 1/r³ form as electric-dipole far-field, with the substitutions stated.
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