Practice question

**Magnetic field lines** form continuous closed loops, direction given by tangent at point, density indicates field strength. Unlike electric field lines, magnetic lines never intersect because unique field direction exists at each point, and bar magnet possesses dipole moment m = N I A directed from south to north pole inside magnet. Magnetic field lines are closest together near the poles of a bar magnet, where the field strength is greatest, as the density of lines reflects the magnitude of the magnetic field. Substituting values gives Near the poles, which matches expected magnitude for this magnetic configuration, confirming dipole field dependence on m/r³ and torque