Sea water at frequency ν=4×108 Hz has permittivity ϵ=81ϵ0, permeability μ=μ0, and resistivity ρ=0.23Ω⋅m. What is the ratio of conduction current to displacement current? [Hint: Consider a parallel-plate capacitor immersed in sea water and driven by a voltage V0cos(2πνt).]