The energy stored gets reduced by a factor gets reduced by a factor `'K'` when the battery is disconnected after charging the capacitor and then the dielectric is introduced.
The energy stored in the capacitor increases by a factor `'k'` when a dielectric is introduced between the plates with the battery present in the circuit.

Options

A. Both A and R false
B. Both A and R true and R is not correct reason for A
C. A is true and R is false
D. Both A and R are true and R is correct reason of A.

Answer

B