4.] Boundary Value Problems A parallel-plate capacitor is constructed to have free charges +O and -O across the rectangular plates of area A (assume to be very large). The separation distance d between the plates are filled with three linear dielectrics of the same thickness d/3: thin films with dielectric constants k = 1.5 adjacent to the metal plates and a denser material k = 2.0 in the middle. Find the displacement and electric fields in the dielectrics. What is the potential difference between the plates? A K = 1.5 d/3 K = 2.0 d/3 K = 1.5 d/3 O