A parallel plate capacitor of area $\mathrm{A}=16 \mathrm{~cm}^2$ and separation between the plates 10 cm is charged by a DC current. Consider a hypothetical plane surface of area $A_0=3.2 \mathrm{~cm}^2$ inside the capacitor and parallel to the plates. At an instant, the current through the circuit is 6 A . At the same instant the displacement current through $A_0$ is $\_\_\_\_$ mA .