The material filled between the plates of a parallel plate capacitor has resistivity $200 \Omega \mathrm{~m}$. The value of capacitance of the capacitor is 2 pF . If a potential difference of 40 V is applied across the plates of the capacitor, then the value of leakage current flowing out of the capacitor is : (given the value of relative permittivity of material is 50 )