Two parallel plate capacitors C_1 and C_2 each having capacitance of 10 μ F are individually charged by a 100 V D.C. source. Capacitor C_1 is kept…

Two parallel plate capacitors $\displaystyle \mathrm{C}_1$ and $\displaystyle \mathrm{C}_2$ each having capacitance of $\displaystyle 10 \mu \mathrm{~F}$ are individually charged by a $\displaystyle 100$ V D.C. source. Capacitor $\displaystyle \mathrm{C}_1$ is kept connected to the source and a dielectric slab is inserted between it plates. Capacitor $\displaystyle \mathrm{C}_2$ is disconnected from the source and then a dielectric slab is inserted in it. Afterwards the capacitor $\displaystyle \mathrm{C}_1$ is also disconnected from the source and the two capacitors are finally connected in parallel combination. The common potential of the combination will be $\displaystyle \_\_\_\_$ V. (Assuming Dielectric constant $\displaystyle =10$ )