Seawater at a frequency f = 9 $\times$ 102 Hz, has permittivity $\varepsilon$ = 80 $\varepsilon$ 0 and resistivity $\rho$= 0.25 $\Omega$ m. Imagine a parallel plate capacitor is immersed in seawater and is driven by an alternating voltage source V(t) = V0 sin(2 $\pi$ ft). Then the conduction current density becomes 10x times the displacement current density after time t = ${1 \over {800}}$ s. The value of x is $\underline{\hspace{2cm}}$. (Given : $${1 \over {4\pi {\varepsilon _0}}} = 9 \times {10^9}$$ Nm2C $-$ 2)