Two parallel plate capacitor with different plate seperation but the same capacitance are connected in series to a battery. Both capacitors are filled with air. The quantity that is $NOT$ the same for both the capacitors when they are fully charged is
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As two capacitors are in series so charge on both of them would be same. As they are having same capacitances so potential difference across each would be same and hence energy stored. But due to different plate seperation from $E = V/d$ can say that $E$ would be different.
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