The plates of a parallel plate capacitor are d= 2.0 mm apart and each plate has an area A = 2.0 x 10^–4 m². The space between the plates is completely filled with a linear dielectric material  of dielectric constant K = 2.0.  The capacitor is connected to a source of emf of 2.0 x 10² V.  The electric field between the plates is

1.0 x 10⁵ Vm^–1

$ E = \frac{V}{d} = \frac{2\times 10^2}{2\times 10^{-3}} = 10^5 V/m$