Find the relative permittivity (E,) of the dielectric material present in a parallel-plate capacitor if: (a) S = 0.12 m2 , d = 80 m, Vo= 12 V and the capacitor contains 1uJ of energy (b) The stored energy density is 100 J/m, Vo= 200 V, and d = 45 m (c) E = 200 kV/m and p,= 20 C/m %3D %3D 20 C/ ? Ans: (a) 1.05 (b) 1.14 (c) 11.3