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Q.

The force of attraction between two charges separated by certain distance in air is F1. If the space between the charges is completely filled with dielectric of constant 4 the force becomes F2. If half of the distance between the charges is filled with same dielectric the force between the charges is F3. Then F1 : F2 : F3 is

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a

16 : 9 : 4

b

9 : 36 : 16

c

4 : 1 : 2

d

36 : 9 : 16

answer is D.

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F=14πϵ0∈rq1q2d2
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