The plates of a parallel plate capacitor are separated by d . Two slabs of different dielectric constant K 1 and K 2 with thickness 3 8 d and d 2 , respectively are inserted in the capacitor. Due to this, the capacitance becomes two times larger than when there is nothing between the plates. If K 1 = 1.25 K 2 , the value of K 1 is:

1. A. 1.33
2. B. 2.66
3. C. 2.33
4. D. 1.60

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