In a parallel plate capacitor the separation between plates in 3x. This separation is filled by two layers of dielectrics, in which one layer has thickness x and dielectric constant 3k, the other layer is of thickness 2x and dielectric constant 5k, If the plates of the capacitor are connected to a battery, then the ratio of potential difference across the dielectric layers is
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We know that capacitance of a parallel plate capacitor is given by
Here 
dielectric constant.
A = area of parallel plate
d = distance between the plate.
Now, 
In series combination of capacitor, stored charge in each capacitor is same i.e. 
So, 
and 
and 
The ratio 
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