For a plane electromagnetic wave, let be the average magnetic energy density and ⟨u⟩ the average total electromagnetic energy density. If ⟨u⟩/ = N, find N.

Question

G1 Physics · Accepted Answer

For a plane electromagnetic wave, ⟨uₑ⟩ = ⟨uₘ⟩. Hence, ⟨u⟩ = ⟨uₑ⟩ + ⟨uₘ⟩ = 2⟨uₘ⟩. Therefore, ⟨u⟩/⟨uₘ⟩ = 2. Hence N = 2.

For a plane electromagnetic wave, let <uₘ> be the average magnetic energy density and ⟨u⟩ the average total electromagnetic energy density. If ⟨u⟩/<uₘ> = N, find N.