Home › Karnataka PUC II › physics › magnetism_and_matter › The far-field of a bar magnet at distance r >> l…
The 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.
Related questions
The magnetic moment vector m of a bar magnet pointsWhich of the following is INCORRECT about magnetic field lines?Two identical-looking iron bars A and B; one is a magnet, the other unmagnetised iron. TheThe work required to rotate a magnetic dipole of moment m in a field B from θ = 0 to θ = 1The pole strength of a magnet has SI unitA magnetic needle is in stable equilibrium when its magnetic moment m isThe equatorial field of a short bar magnet of moment m at large distance r isThe axial field of a short bar magnet of moment m at large distance r is