A parallel plate air capacitor of capacitance C is connected to a cell of emf V and then disconnected from it. A dielectric slab of dielectric constant K, which can just fill the air gap of the capacitor is now inserted in it. Which of the following is incorrect? [NEET 2015]

• A. The potential difference between the plates decreases K times
• B. The energy stored in the capacitor decreases K times
• C. The change in energy stored is \[\frac{1}{2}C{{V}^{2}}\left( \frac{1}{K}-1 \right)\]
• D. The charge on the capacitor is not conserved