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. Diamagnetic materials have a small negative susceptibility ( chi < 0 ), causing them to weakly repel magnetic field lines. This occurs because an applied magnetic field induces an opposing magnetic moment in the material, reducing the field inside it. Substituting values gives Diamagnetic, which matches expected magnitude for this magnetic configuration, confirming