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
