The plates of a parallel plate capacitor are separated by d Two slabs of different dielectric constant K1 and K2 with

The plates of a parallel plate capacitor are separated by d Two slabs of different dielectric constant K1 and K2 with thickness 3 8 d and 2 d , respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If K1 = 1.25 K2, the value of K1 is: 

(1) 2.66                       (2) 2.33 

(3) 1.60                       (4) 1.33                     (NEET-2025)