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Consider a plate capacitor immersed deep in seawater with its plates close together; time-varying voltage applied across the plates is

u=U0cos(2πft),wheref=4108Hz.

At this frequency, the permittivity of seawater is approximately ε = 81ε0, permeability is approximately μ = μ0 and electric resistivity is ρ = 0.23 Ω·m.

Estimate the amplitude ratio of a density of free current and a density of Maxwell’s displacement current between the plates using quasi-stationary approach. Consider whether the use of quasi-stationary approach is correct.

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