Question

given B=B₀sin(kx-wt), what is the magnetic energy density associated with the em wave?
and what is the energy density associated with the wave?(is it 2 times the first answer)?

Answer 1

Energy density of em wave isB0^2/μ0.
Energy density of magnetic field in an em wave is B0 ^2/2μ0.


Average energy density is twice of magnetic field energy density