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(D) When capacitors are connected in series, the charge $Q$ on each capacitor is the same.Since both capacitors have the same capacitance $C$, the pot

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Electric field between the plates

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(D) When capacitors are connected in series, the charge $Q$ on each capacitor is the same.Since both capacitors have the same capacitance $C$, the potential difference across each capacitor, given by $V = Q/C$, is also the same.The energy stored in a capacitor is given by $U = Q^2 / (2C)$. Since $Q$ and $C$ are the same for both, the stored energy is also the same.The electric field between the plates of a parallel plate capacitor is given by $E = V/d$. Since the potential difference $V$ is the same but the plate separations $d$ are different, the electric field $E$ must be different for the two capacitors.

Two parallel plate capacitors with different plate separations 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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