For a sinusoidal electromagnetic wave, the ratio of average total energy density to average electric energy density is:
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Question

For a sinusoidal electromagnetic wave, the ratio of average total energy density to average electric energy density is:

G1 Physics · Accepted Answer

For a plane electromagnetic wave, ⟨uₑ⟩ = ⟨uₘ⟩. The average total energy density is ⟨u⟩ = ⟨uₑ⟩ + ⟨uₘ⟩ = 2⟨uₑ⟩. Therefore, ⟨u⟩/⟨uₑ⟩ = 2. Correct option: C.