A capacitor of 10 μ F capacitance whose plates are separated by 10 mm through air and each plate has area 4 cm^2 is now filled equally with two…

A capacitor of $\displaystyle 10 \mu \mathrm{~F}$ capacitance whose plates are separated by $\displaystyle 10$ mm through air and each plate has area $\displaystyle 4 \mathrm{~cm}^2$ is now filled equally with two dielectric media of $\displaystyle \mathrm{K}_1=2, \mathrm{~K}_2=3$ respectively as shown in figure. If new force between the plates is $\displaystyle 8$ N . The supply voltage is $\displaystyle \_\_\_\_$ V.