Electrostatic Potential And Capacitance

Physics
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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?

A
The change in energy stored is
B
The charge on the capacitor is not conserved
C
The potential difference between the plates decreases K times
D
The energy stored in the capacitor decreases K times
Hard
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