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 ?

Options

A. The potential difference between the plates decreases K times
B. The energy stored in the capacitor decreases K times
C. The charge in energy stored is `1/2 CV^(2) (1/K-1)`
D. The charge on the capacitor is not conserved

Answer

D