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The force of attraction between two char...

The force of attraction between two charges separated by certain distance in air is `F_(1)` .If the space between the charges is completely filled with dielectric of constant `4` the force becomes `F_(2)` .If half of the distance between the charges is filled with same dielectric the force between the charges is `F_(3)` Then `F_(1):F_(2):F_(3)` is

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