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Three parallel plate capacitors C 1 , C 2 and C 3 each of capacitance 5  F are connected as shown in figure. The effective capacitance between points A and B, when the space between the parallel plates of C 1 capacitor is filled with a dielectric medium having dielectric constant of 4, is:

1. 30  F
2. 9  F
3. 22.5  F
4. 7.5  F

Correct answer: 9  F

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