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Q.

Two metal plates form a parallel plate condenser. The distance between the plates is d. A metal plate of thickness d/2 and of the same area is inserted completely between the plates. The ratio of capacitances in the two cases (later to initial) is :

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a

2 : 1

b

1 : 2

c

1 : 1

d

1 : 4

answer is A.

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Detailed Solution

C=Aε0d, C'=Aε0d2=2Aε0d⇒C'C=21

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