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Q.

Two point charges are kept in air with a separation between them. The force between them is  F1. If half  of the space between the charges is filled with a dielectric of dielectric constant 4 and the force between them is  F2 . If  13rd  of the space between the charges is filled with dielectric of dielectric constant 9. Then  F1F2  is.

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a

10081

b

8164

c

2764

d

1681

answer is D.

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Detailed Solution

F=14πε0q1q2(r+r1k)2

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