The capacitance of a parallel plate capacitor is `C` when the region between the plate has air. This region is now filled with a dielectric slab of dielectric constant `k.` The capacitor is connected to a cell of `emfE`, and the slab is taken out

Options

A. charge CE(k –1) flows through the cell
B. energy E2C(k – 1) is absorbed by the cell
C. the energy stored in the capacitor is reduced by E2C(k – 1)
D. the external agent has to do `(1)/(2) E^(2) C(k-1) 2` amount of work to take the slab out

Answer

A, B, D