Introduction to Electrodynamics · Problem 9.21

Electromagnetic Waves — David J. Griffiths

Physics · electromagnetic-waves-in-conductors-energy

Problem

(a) Calculate the (time-averaged) energy density of an electromagnetic plane wave in a conducting medium (Eq. 9.138). Show that the magnetic contribution always dominates. [Answer: (k2/2μω2)E02e−2κz(k^2/2\mu\omega^2)E_0^2 e^{-2\kappa z}] (b) Show that the intensity is (k/2μω)E02e−2κz(k/2\mu\omega)E_0^2 e^{-2\kappa z}.

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