Practice question

**Soft ferromagnetic materials** have low coercivity and retentivity, narrow hysteresis loop, lose magnetism when external field removed, ideal for electromagnets and transformer cores. Energy loss per cycle proportional to loop area, explaining why soft materials minimize loss. The torque on a magnetic dipole is given by tau = m B sinθ . It becomes zero when sinθ = 0 , which occurs when the dipole is aligned with the field ( θ = 0° ) or anti-aligned ( θ = 180° ), as the cross product m × B vanishes. Substituting values gives The dipole is parallel or anti-parallel to the field, which matches expected