alleryEnergy density of magnetic field B in vacuum:
AB²/(2μ₀)
BB/(2μ₀)
Cμ₀ B²
DB/μ₀
Answer & Solution
Correct answer: A. B²/(2μ₀)
u_B = B²/(2μ₀).
Analogous to u_E = (1/2)ε₀E².
EM waves carry equal electric and magnetic energy densities.
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