Physics - Capacitor Question with Solution | TestHub

The distance between two plates of a capacitor is$d$and its capacitance is$C_1$, when air is the medium between the plates. If a metal sheet of thickness$\frac{2d}{3}$and of the same area as plate is introduced between the plates, the capacitance of the capacitor becomes$C_2$. The ratio$\frac{C_2}{C_1}$is