A parallel plate capacitor consisting of two circular plates of radius 10 cm is being charged by a constant current of 0.15 A. If the rate of change of potential difference between the plates is $7\times {10}^8$V/s then the integer value of the distance between the parallel plates is –
$(\text{Take},{ϵ}_0=9\times {10}^{-12}\frac{\mathrm{F}}{\mathrm{m}},\pi =\frac{22}{7})\_\_\_\_\_\_\_\_\mu \mathrm{m}\text{.}$