For changing the capacitance of  a given parallel plate capacitor, a dielectric material of dielectric constant K is used, which has the same area as the plates of the capacitor. The thickness of the dielectric slab is $\frac{3}{4}$ d, where‘d’ is the separation between the plates of parallel plate capacitor. The new capacitance (C’) in terms of original capacitance ($C_0$) is given by the following relation: