Field and Wave Electromagnetics 2nd Edition by David Cheng

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The upper and lower conducting plates of a large parallel-plate capacitor are separated by a distance d and maintained at potentials V 0 and 0, respectively. A dielectric slab of dielectric constant 6.0 and uniform thickness 0.8d is placed over the lower plate. Assuming negligible fringing effect, determine
a) the potential and electric field distribution in the dielectric slab,
b) the potential and electric field distribution in the air space between the dielectric slab and the upper plate,
c) the surface charge densities on the upper and lower plates.
d) Compare the results in part (b) with those without the dielectric slab.