tricky capacitor

[broegger]

how do you derive the capacitance of a parallel-plate capacitor with two different dielectric materials between the plates (for simplicity: each material occupy exactly half of the space between the plates; that is, if the distance between the plates is d, the width of each dielectric material is d/2)...?

[Guybrush Threepwood]

think about two capacitor in series.....