In an electromagnetic wave the electric and magnetizing fields are 100 V/m and  0.265A/m. The maximum rate of energy flow is

Amplitude of electric field,  E0=100V/mAmplitude of magnetizing field  H0=0.265 A/mThe maximum rate of energy flow is poynting vector   =E0B0μ=E0×H0=100×0.265           ∴ S=26.5 Wm−2