A capacitor has capacitance 5 μ F when it's parallel plates are separated by air medium of thickness d. A slab of material of dielectric constant 1.5…

A capacitor has capacitance $\displaystyle 5 \mu \mathrm{~F}$ when it's parallel plates are separated by air medium of thickness d. A slab of material of dielectric constant $\displaystyle 1.5$ having area equal to that of plates but thickness $\displaystyle \frac{d}{2}$ is inserted between the plates. Capacitance of the capacitor in the presence of slab will be $\displaystyle \_\_\_\_$ $\displaystyle \mu \mathrm{F}$.