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Two metallic plates form a parallel plate capacitor. The distance between the plates is 'd'. A metal sheet of thickness 2 d and of area equal to area of each plate is introduced between the plates. What will be the ratio of the new capacitance to the original capacitance of the capacitor ?

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

Correct answer: 2 : 1

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