A capacitor is connected to a cell. Electric field at a point in the space between the plates is ${\mathrm{E}}_{\mathrm{o}}$, energy stored in the capacitor is ${\mathrm{U}}_{\mathrm{o}}$, charge stored in the capacitor is ${\mathrm{Q}}_{\mathrm{o}}$ and capacitance of the capacitor is ${\mathrm{C}}_{\mathrm{o}}$. When a slab of dielectric material ( dielectric constant k) b is introduced in the space between the plates, above quantities become E,U,Q and C. Then,