Two neutral bodies of masses $m_1$ and $m_2$ are kept at a distance of r cm from one another in a vacuum medium. A gravitational force F acts between the two bodies. The entire set-up is then transferred, as it is, to a water medium. The force between the bodies is then $F_w$. The ratio of F to $F_w$ is:
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Gravity is a universal force! It does not care whether objects are separated by air, water, glass, or solid lead blocks—the gravitational force between two fixed masses always remains exactly identical, giving a ratio of $1:1$.