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A parallel plate capacitor with air betw...

A parallel plate capacitor with air between the plates has capacitance of 9pF. The separation between its plates is 'd'. The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant` k_1=3` and thickness d/3 while the other one has dielectric constant` k_2=6 `and thickness `(2d)/(3)`. Capacitance of the capacitor is now

A

1.8 pF

B

20.25 pF

C

40.5 pF

D

45 pF

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