$A$ parallel plate air capacitor has capacity $C$ farad, potential $V$ volt, and energy $E$ joule. When the gap between the plates is completely filled with a dielectric of dielectric constant $K$, what happens to the potential $V$ and energy $E$?
- A$V$ increases, $E$ decreases.
- B$V$ decreases, $E$ increases.
- CBoth $V$ and $E$ increase.
- DBoth $V$ and $E$ decrease.
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