**Q. Two parallel plate capacitors X and Y, have the same area of plates and same separation between plates. X has air and Y with dielectric of constant 2 , between its plates. They are connected in series to a battery of 12 V. The ratio of electrostatic energy stored in X and Y is-**(i) 4:1

(ii) 1:4

(iii) 2:1

(iv) 1:2

**Answer: (iii) 2:1**