Practice question

**Torque on magnetic dipole** in uniform field B is τ = m × B, magnitude τ = m B sinθ, m moment (A·m²), B field (T), θ angle between m and B (degrees). Torque tends to align moment with field, zero at θ = 0°, maximum mB at 90°, direction given by right-hand rule. U_m = -m B cosθ . Given: m = 0.6 A m² , B = 0.3 T , θ = 60° , cos 60° = 0.5 . Substitute: U_m = -0.6 × 0.3 × 0.5 = -0.09 J . Substituting values gives -0.09 J, which matches expected magnitude for this magnetic