MCQ
A parallel plate capacitor has plates with area $A$ and separation $d$ . A battery charges the plates to a potential difference $V_0$ . The battery is then disconnected and a dielectric slab of thickness $d$ is introduced. The ratio of energy stored in the capacitor before and after the slab is introduced, is
- ✓$K$
- B$1/K$
- C$\frac{A}{{{d^2}K}}$
- D$\frac{{{d^2}K}}{A}$
