An electromagnetic wave propagating in seawater has an electric held with a time variation given by E = ẑE0 cos ωt. If the permittivity of water is 81ε0 and its conductivity is 4 (S/m), find the ratio of the magnitudes of the conduction current density to displacement current density at each of the following frequencies:
(a) 1 kHz.
(b) 1 MHz.
(c) 1 GHz.
(d) 100 GHz.
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