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Two similar point charges q1 and q2 are ...

Two similar point charges `q_1 and q_2` are placed at a distance r apart in the air. The force between them is `F_1` . A dielectric slab of thickness `t(ltr)` and dielectric constant K is placed between the charges . Then the force between the same charge . Then the fore between the same charges is `F_2` . The ratio is

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