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The distance between two plates of a capacitor is d and its capacitance is C 1 , when air is the medium between the plates. If a metal sheet of thickness 3 d 2 and of the same area as plate is introduced between the plates, the capacitance of the capacitor becomes C 2 . The ratio 1 2 C C is -

1. 3 : 1
2. 2 : 1
3. 4 : 1
4. 1 : 1

Correct answer: 3 : 1

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