Please correct me if I am wrong.
Say the voltage across the slabs is Vt, then Vt = V1 + V2, where V1,
V2 are voltages across the two different dielectric materials.
Therefore,
Vt = Q*d1/(E1 * A) + Q*d2/(E2 * A),
where Q = charge in Coulomb, d = thickness of material, E = dielectric
constant, and A = area.


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