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 enerty stored in the capacitor decreased `K` times
C. The change in energy is `1/2C_(0)varepsilon^(2)(K-1)`
D. The change in energy is `1/2C_(0)varepsilon^(2)(1- 1/K)`

Answer

A, B, D