Practice question

**Magnetic dipole moment** quantifies strength and orientation of magnet, m = 2l × q_m where q_m pole strength. Field line concept visualizes B, with closed nature reflecting absence of magnetic monopoles, explaining non-intersection and continuity. Diamagnetic materials reduce the magnetic field inside them slightly because an external field induces weak currents that create an opposing magnetic moment, resulting in a small negative susceptibility and a minor field reduction. Substituting values gives Induced opposing magnetic moments, which matches expected magnitude for this magnetic configuration, confirming dipole field dependence on m/r³ and torque relation τ = m B sinθ.