$\mathrm{Seawater\; at\; frequency\; \nu }=4\times {10}^8<mspace\; width="1em"></mspace>\mathrm{Hz}<mspace\; width="1em"></mspace>\mathrm{has}<mspace\; width="1em"></mspace>\mathrm{permittivity}<mspace\; width="1em"></mspace>\mathrm{\epsilon }\approx 80{\mathrm{\epsilon }}_0,\hspace{0.17em}\mathrm{permeability}<mspace\; width="1em"></mspace>\mathrm{\mu }\approx {\mathrm{\mu }}_0$ and resistivity $\mathrm{\rho }$=0.25 $\mathrm{\Omega }$-m. Imagine a parallel plate capacitor immersed in seawater and driven by an alternating voltage source $\mathrm{V}\left(\mathrm{t}\right)={\mathrm{V}}_0\sin \left(2\mathrm{\pi \nu t}\right).$ What fraction of the conduction current density is the displacement current density?