A parallel plate capacitor contanins a mica sheet (thickness 0.5+×10−3 m) . And a sheet of fiber (thickness 0.5×10−3m) . The dielectric constant of mica is 8 and that of thye fiber is 2.5 Assuming that the fiber breaks down when subjected to an electric field of 6.4 × 106V m^−1. , find the maximum safe voltage that can be applied to the capacitor.

