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Q.

Two metallic plates form a parallel plate capacitor. The distance between the plates is ‘d’. A metal sheet of thickness  d2  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? 

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a

2 : 1

b

1 : 4 

c

1 : 2 

d

4 : 1

answer is A.

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Detailed Solution

C1=∈0Ad C2=∈0Ad2+d/2α=2∈0Ad C2C1=21

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