Question

A parallel plate capacitor is composed of two lossy media with relative dielectric constant &ri 12 and 82 3.5, and thickness di 1.5mm and d 3.5mm. Lossy nature manifests itself through a steady-state leakage current with the normal component Jn flowing across the interface between the two dielectric media which have electrical conductivity o1 2x 10-3 and a2 = 5 x 104 S/m, respectively. The two media have dielectric strength EMaxt = 60 MV/m and EMax2 25 MV/m respectively, where 1 MV/m 1 x 106 V/m. Find a) the surface charge density p, that accumulates at the interface when the E- field in material 1 is E2 10 kV/cm b) The current density Ja flowing when E2 10 kV/cm c) the maximum voltage Viax that the capacitor can sustain at the onset of dielectric breakdown (4 points) (2 points) (4 points)

Answer 1

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