alleryStart learning →Energy density in magnetic field B is:
Au = B²/(2μ) (J/m³) — for linear magnetic material
BB²/2
CB/μ
DμB
Answer & Solution
Correct answer: A. u = B²/(2μ) (J/m³) — for linear magnetic material
**Magnetic energy density:** u_m = B²/(2μ) = ½ BH (for linear).
**Electric field equivalent:** u_e = ½ εE².
Used in calculating energy stored in inductor: U = ∫u dV.
**EM waves:** u_e = u_m (equipartition).
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