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Seawater at frequency v = 4 108 Hz has permittivity ε = 80 ε, permeability μ= μ and resistivity ρ = 0.25 Ωm. Imagine a parallel plate capacitor immersed in seawater and driven by an alternating voltage source V(t) = V sin (2πvt). What fraction of the conduction current density is the displacement current density?