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. The absence of magnetic monopoles means that magnetic field lines are continuous and form closed loops. As a result, the number of field lines entering a closed surface equals the number leaving it, leading to a net magnetic flux of zero, as per Gauss’s law for magnetism. Substituting values gives The non-existence of