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

Answer

B

Explanation

`Delta U = U_(2) - U_(1) V = (V)/(K)`