1. Calculate the relative permittivity of the dielectric material used in a parallel plate capacitor if:
a) S=0.12m2, d=80µm, vo=12v and the capacitor contains 1µJ of energy.
b) Stored energy density is 100J/m3, vo=200v and d=45 µm.
c) E=200kv/m , ρs=20µc/m2, d=100 µm