Question

The energy density of an electromagnetic wave moving with velocity c in space of permittivity ɛ₀ and permeability μ₀ is given by [E₀ and B₀ are amplitudes electric field and magnetic field]

(d) All of these

Answer 1

Correct option: (d) All of these

Average electric energy density,

Average magnetic energy density,

Now, E₀ = cB₀ ...(iii)

From Eqs. (i) and (ii), we get

U_E = U_B

∴ Energy density of electromagnetic wave,

U = UE + UB = 2UE = 2UE