Practice question

**Transverse nature** means E and B perpendicular to direction, e.g., wave propagating along z, E along x, B along y, Poynting vector S = E×B/μ₀ along z, energy flow direction. E and B in phase, maxima together, ratio fixed c. Using B₀ = (E₀/c) , we have B₀ = (45/3 × 10⁸) = 1.5 × 10⁻⁷ T . Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields 1.5 × 10⁻⁷ T, illustrating EM wave transverse nature and Maxwell's displacement current concept.