Question

Let E = E₀x and H = H₀y and E₀/H₀ = sqrt(μ₀/ε₀) =377 Ohms, where bold x and y indicate unit vectors. Show that E x H = P and that P, the “Poynting” vector, points in the z direction, and that P has the dimension of Watts/m2. This defines a TEM, or transverse electromagnetic mode in free space. In materials, such as dielectrics in a cable, the appropriate values of μ and ε are to be used.

Answer 1